Try and forgive me if this post is overly-paranoid.
I'll try.
If I (a U.S. national living in Thailand and hoping never to return to my homeland) were to have a baby with my Thai wife, does that potentially put me at risk of having to pay U.S.-caliber child support?
Don't know if "U.S.-caliber" but you fathered a child, there should be no discussion in that you should take care of your child. Period. Why would you think otherwise?
I believe the going rate for Thai child support is like 100 baht per day or something. Fine by me. Glad to help out. So, if that's the worst that could happen, then I couldn't care less.
You're not buying cattle. You're talking about raiding a child. 100 baht per day ($3 USD) or ain't squat to take care of a kid. If you're that worried about it, then get snipped, cover your crotch rocket, or abstain from sleeping with anything with ovaries.
But I do NOT want to face the risk (in the event the marriage dissolves) of having to go back to the U.S. and get a real job to pay a serious monthly sum to support my kid in Thailand.
If the marriage dissolves (and you're on a marriage visa) then you either convert it into a visa which allows you to stay or you must leave the country. Being that you think 100 baht is good to take care of a kid, I don't see you meeting the other financial requirements.
Also, what about the prospect that the marriage dissolves, and then she (if feeling highly vindictive) uses the kid (who, I believe, would technically be an American citizen) as some sort of anchor-baby to get into the U.S., thereby forcing me to return to that place and work to support it (and her)? Does this type of mess happen?
Okay, I ready this whole thing. Is this a joke? Seriously? IMO it's this kind of mentality that leads to a lot of kids being born with fathers absent from their lives. Do yourself a favor now and don't even think about procreating. It would be better for everyone.