Not if they're asking within the confines of this forum. TFL is a great place to share anything firearm related, including pics of your guns. I see where many members actually have the guns they own listed in their signature box.
Part of the reason I log into this forum on a regular basis is to see what other people are shooting, have just bought, or own. The combined information, pics, opinions, and user feedback is a great resource for all shooters.
If everyone was to paranoid or worried to reveal some or all of their collection, then we probably wouldnt have a whole lot to discuss. As long as theyre not asking for my street address and safe combination, I personally have no problem with it... but that's just me.