Tau.Neutrino said:

Bubblecar said:

btm said:

A reasonable amount: say $10 per answer. I haven’t really considered what I’ll do if they refuse to pay; I’ll still be obliged to provide answers.

Make sure they understand that they’re not allowed to make any use of your particular answers without payment.

$50 per question here but I’m adding additional charges for how much time it takes to answer each question.

Seems fair.