lordpasternack wrote:Curiously though, we're generally happy about the paid 'adoption' of other sentient beings (other animals) - and we are happy to view that as essentially benign, since in most cases it is. Most people who buy pets, either off breeders or owners who suddenly found themselves with a litter on their hands, buy them out of the best of intentions. Why do we find that okay, but squick at the thought of doing likewise with human young?

I thought that the issue was about adopting kids as a paid commodity, not ladies offering 9 months of their lives as a womb surrogate.
The latter case (assuming the lady got impregnated especially for the occasion, and the child ideally has the genes of at least one of the destinated parents), is indeed one where a person renders a service, and some would deem she deserves to be handsomely compensated for it. Of course, it might also be argued that such a service, given how closely it touches to the basics of human personhood, even involving long term use of the lady's genital tract and the creation of a new human, should simply not be made commercially available. There are countries where surrogate mother services are illegal, and children born through them won't be recognized as belonging to the destination parents by the powers that be, even if they are those parents' genetic offspring.
The former case, however, is more clear cut. A humman person is not within the realm of commerce, nor is parental responsibility over a minor. Actually, a parent who cannot take proper care of a child, and is ready to relinquish it, should be happy that it will be raised by a good family, not looking to make additional profit, in addition to the savings made from not having expenses from the kid any more. The adopters are already willing to take up the considerable costs of raising a kid to adulthood, and possibly beyond, and they should not be milked for more, as more actually is tantamount to an actual commercial transaction, and that is no longer adopting one's descent, that's buying a slave or toy.