You can't realy compare "success rate" because there is much more to it.
Say there is 100 girls out there. Only 3 of them are horny, e.g. willing to sleep with you with low effort, and 7 are someow undecided, perhaps they would sleep with a guy who knows what is he doing.
So, Guy A has absolutelly no knowledge about seduction, he just goes out looking for a GF, randomly meets those 100 girls, perhaps meets them online, and somehow he talks to all of them. He gets rejected many times, but he keeps looking till he reaches 100 girls. If he meets a new girl every three days, it might take him the whole year to find GF. Maybe then he finds a girl and he gets laid after couple of dates. His success rate is 1/100, or 1% and it took him a year. He's got a GF now and is not looking for more girls. He doesn't feel miserable, he feels great.
Guy B just opened GC site and reads couple articles. He knows he's got to approach. But he doesn't really have many skills, and he is really shy, inexperienced. But he's got the balls, so he goes out and talks to 100 women. He actively approaches about 5 girls every day or so. Because he's got low skills (but doing something and pushing for sex), his success rate is 3/100 (those 3 horny girls), or 3%. It took him 3-4 weeks to get laid with those 3 girls, and he's got 2 more interested in him. Maybe he'll get them next month. But he feels miserable because he excerted a lot of effor and time, he is not happy with himself.
Guy C is quite skilled, he knows a lot and is experienced. He can "read" girls well, he knows what to look for. Right there he eliminates 50 girls because he knows they are not interested, just by looking at them he knows that there is no way they will have sex with him. Maybe he walks around the other 50 girls, and sees that some of them show some interest. So he talks to them, but quickly eliminates another 30 girls because he sees that the interest is not high enough and that he would most likely be wasting lots of effort. So he's left with 20 now. He talks more, perhaps asks for their numbers. Just the way they handle him the number and the way they talk, he can now deffer that some of them are not that interested, so he doesn't even bother to invite them for a date, or just texts them knowing that some girls won't even bother to reply. So now he's left with say 12 girls who will really go for a date with him. 12 girls = 12 days. 6 of them will sleep with him on a first date because he's got good skills. 2 more sleep with him on second and third date, and he could maybe get 2 more girls on subsequent dates, if he waits long enough. So that is 8-10 girls he could sleep with (out of original 100). He is not happy nor misearable. The girls are just there, some of them are open and others not. Why bother with those who are closed? Why capitalize on all of those girls that are open? Who really cares, maybe today, maybe next week, maybe never...
How long does it take him to "meet" those 100 girls? It depends on his activity, what he does and where he goes. Maybe one week, maybe two months. He doesn't really "meet" all 100 girls though, he only focuses on those who show enough interest...
BUT, it all depends how you look at it. If you count these 8-10 girls that he slept with out of the original 100, it is only 8-10% success rate. Since he eliminated 50 girls just by "reading" them and not even bothering to talk to them, his success doubles: 16-20% (8-10 girls out of 50). If he doesn't count girls he just talked to but found them not being attracted enough (those 30 he eliminated by seeing that they are not intersted enough), his success rate is even higher: now we are talking about 8-10 girls out of 20, so about 50%. That is a big success, huge success.
Also note that Guy C is not really approaching actively. He does much less work than the other two guys above. So, in fact Guy B can get 3 girls with maximum effort, and guy C can get the same or higher number of girls with "no effort" at all. The success of Guy C is not in approaching. He doesn't approach at all. His success is in eliminating girls with low interest and acting in those with high interest... At the same time, if he was approaching he could get even more girls...
AND, if Guy C counts only those 12 girls he really went for a date with, his success is very high, perhaps 80%. Does it mean that he is able to sleep with 80 out of any 100 girls? Nope, no way. It just means he is able to capitalize on girls that he recognized as having high interest in him...
So, you can't really just take the numbers and plug them into a formula, that is quite misleading. If a guy has good experience he will simply focus only on girls that are showing true potential to get laid, and he will simply walk away from those who don't show much interest. Another thing, if the girl shows good potential/interest, you don't really need that many seduction skills. You just let it "flow" naturally because she is simply interested in you and she is excerting enough efort on her own...