Fem seeds serve a purpose, they give the consumer the chance to flower all seeds and know (or hope) they are 100% female and not bisexual or male. However the process of making them is not natural and the more that people use these the more companies will produce them.
For those who say, so what you grow your regs I'll grow my fems no big deal, well it is a big deal. Strains are created when a male spews his pollen on a female plant. Virtually all strains available are the creation of breeder A's genetics crossed with Breeder B's genetics (there so much more but I don't want to go into too much detail). As more and more companies sell only fem seeds, it means less option for Father plants making it so that only the breeder can breed 2 of their strains together. For instance say you have (haha had to pause and look up some strains, I don't shop fems) GHS White Widow and also their Great White Shark and you're thinking you know i love the high of this one but wish it grew bigger buds like the other, well problem is there is no father of either to pollinate the other with, this limiting new strain creation.
Go regular, like an earlier poster said if you wanted seeds you can make them. The way I look at it is this, are you in it for some smoke and maybe a few bucks or are you in it for free smoke that is better than anything anyone else around you can get and are willing to take the time to fill your garden with 4-5 (could be more could be less) killer strains that you have hand selected keepers of over a couple years?
Keep in mind if you grow out a 6 pack get 3 fems, even if 2 of those aren't as good as the 3rd you still got free smoke and who knows maybe after a month or so you realize plant 2 is actually a super tasty or super stoney smoke.