Check the files of the Harris County Medical Society. Make a few random calls to the male MDs. See what percentage sold semen to pay for textbooks. Couldn't find any online sperm banks with photos of donors. Send a photo of someone you'd like your child to look like, and it will be compared with donor mug shots to find a match.
Geneticists have some reason for concern.
If Harris' scheme is successful, more dot-coms of a similar sort will be on the horizon, and an implosion of genetic stock will do us no good. Economists can offer geneticists some comfort. And there's good reason, among fertile people, that this slope is neither steep nor slippery. My guess is that 0.02 percent of guys might stop to think before smiling and declining. I don't presume to speak for women.