This is so great Peter-- first I've heard of pgtestdb and it's immediately useful for me. How can people donate money to the pgtestdb project? Or hire you for consulting for pgtestdb? I'm joel@joelparkerhenderson.com and would love to help fund your work.
I sincerely appreciate the sentiment and the offer — but pgtestdb is MIT license, actual, for real, not kidding, open source. No payment necessary; please enjoy.
(I'm always open to discuss potential contracts or consulting opportunities. If you have one that you think might be a good fit, my email is in my profile here and on github and on my homepage.)