I'm just thinking about requests that ask for a recommendation for a product or a service that won't be purchased right away (like finding a certain kind of restaurant with certain parameters, but not getting food delivered from it, or finding a certain kind of professional service without immediately contracting for it).
Or for that matter factual questions like "Who won the 2014 Oscar for Best Documentary Feature?".
Would this somehow look like "I found 3, and I'll tell you about them for $5, OK?"? Will people be more resistant to paying the fee if the fee is the only item they're paying, rather than bundled with the price of some other transaction?