Is he offering to compensate you in some way? A nice dinner? Pizza and beer? Because if not, no. And it's not selfish to not want to be permanent tech support or to decide not to help someone with a really involved task for free.
Adam MacLeod (mastodon.stickbear.me)
@acarson I have yet to receieve nor hear of any offer of compensation of any sort. And thanks for affirming what I also felt.