You'll be hard pressed to find anyone that hasn't dry fired period. At one time or another most do it. For most weapons it's not a real big deal but a snap cap is way too inexpensive to not have a couple laying around. If all insurance was so cheap eh?

i had to dry fire my P-11 after each stage of IDPA. I was not happy about this and argued with some, but ce la ve. No harm yet, but i try to follow the KEL_TEC manufactures instructions anduse snap caps. Now granted the p-11 is the older action, but the p-3at and pf-9 say the same thing. There is no real reason to realese the trigger on them though

Kel-Tec requires you to use snap-caps for dry-fire practice.
This is because, in all Kel-Tec pistols, the firing pin is retained by the same screw that secures the extractor spring. Every time you dry-fire your Kel-Tec pistol without a snap-cap, the firing pin slams into the extractor-spring screw. Soon you will have battered the screw so badly that it will be very difficult (maybe even impossible) to remove, and will have to be replaced.
A couple of "clicks" won't hurt anything, but you need to do lots of dry-fire practice to become proficient (and safe) with your little pistol, so snap-caps are cheap insurance.

+1 DevilsJohnson

I've done it I try not to, but I've done it

Happily it hasn't ever hurt the guns I've done it to - I either do not do it now or I use snp caps - you can get them for most calibers now.