I remember back when I first entered college, seeing tons of ads, asking for egg donation, with compensation, like towards the end of my high school career. Just like the military trying to make you a sweet deal to go hang with them for a few years to pay for your college, there were some flyers to attend an informational session about egg donation. Some of the stipulations were that you had to be a certain race, you had to be an attendee or a graduate of an Ivy League University, you had to be from a certain heritage/religion, and you had to be between the ages of 18-24, and no family history of any sort of mental problems, diseases, etc. Most couples are willing to pay your 4-year college tuition, if they want more than one child--they'll want the children to be related as closely as possible.
It's a pretty lucrative business transaction, and I did consider it for awhile, but my scholarship came through. Now that I think about it, I don't think I would have done it, even if the scholarship didn't come through. As you said CB, I don't think I'd want my own lineage being raised by someone else.