Agreed. While it might be a neat-o thing to know if the people who make bitcointalk happen are bitcoin ballers, it's not a question I'd ever ask--and for the same reason I wouldn't ask any member here how much they've got.
I don't understand with users who're saying @OP is exposing forum staffs' privacy when they're the one who share it. If someone share address, everyone can view that and there's nothing wrong. But it's wrong when they have an another address which never been posted, you share it to everyone.
OP's intention wasn't against their privacy though. We must make this clear.
I believe OP may not know that the address you put on your bitcointalk profile may be one of the many addresses the user owns.
In fact, OP can use my profile as a reference. I have set a vanity address starting with 1Apogio which is my username here. I have exposed this address on purpose. Perhaps someone wants to send me some sats, or perhaps I do some transactions on the marketplace here. This is the address I want other users to know. I may have private keys that derive other addresses too. Who knows?!