Hell with it being a shame. I have almost zero respect fro breeders that try and cash in off fem beans under the pretence of making it more convenient for the grower. All it takes with reg seeds is a bit of patience and planning in advance, once you've your fem you're laughing, and have the ability to make a thousand more seeds at your pleasure. Fem "breeders" just want you to have to go back and buy more. Look at Dr Greenthumb, he's just a greedy profiteer, the legitimacy of his genetics aside. I've a small small grow that can't really justify having males in it, but it's easy as pie to grow some out in advance and flower from seed in order to get that female.
I've also seen a lot of threads and grows depicting the difference between a reg and fem seed of the same strain, the reg fem always kicked the arse out of the feminized plant. No science to back that up, just what i've seen fro supposedly respected growers.