The reason most breeders charge more for fems is because timing the reversal/having enough stored pollen is harder than letting a male blow, typically. The second reason is they know that the uninformed custies and those wanting convenience will want fem seeds. They therefore will be able to sell more overpriced packs of, in most cases, lines with much less work put in than their m/f counterpart. MOst customers nowadays think they want fems due to many years of misrepresentation/misinfo by the seed market/breeders to steer people towards fem seeds so that the customer can't reproduce easily with it. Which means they will have a fem seed customer for life instead of a once bought and reproduced for themselves customer.
The reason a worked and tested line of 12 seeds of regulars from a real breeder would, and rightly so, be sold for more money is because, IMO,
1. You can reproduce the line (f2 etc) and hybrids yourself without having to do another generations of reversals. (s2 etc prob not best idea for line work)
2. A good breeder would have tested this male line which requires 3 generations of work to sell the original seeds. You have to grow your parents, make the seeds, then grow the seeds to test, then you can release the previous generation. Easy year+ of work.
3. Because the heady boys "think" they want fems, there's going to be less demand overall for regs. Not that this drop had an issue with that, apparently. Because most growers nowadays are too lazy to grow M/F seeds and make superior selections. They just want whatever their homie is supposedly selling for $4800, NOW. (S1's) Which fems are theoretically better at inbreeding a trait faster. which is good and bad... but mostly bad at this point. Odd thing is, the fems nowadays are such inbred clusterfucks that, IME, I'm pretty much only buying regs from now on. Too many issues with people's fems today due to low selection pressure and highly inbred parents. It's all cookie cousin tranny fucking!