Aw, shucks. C'mon Rhino- I suck.

People often say that competition adds stress to your shooting by having to perform in front of an audience, however small. While it's no comparison to having an audience that shoots back, it's something.
In a similar vein- Knowing you're the only guy there who is shooting from concealment, ducking behind fake walls, and shooting from Weaver can add a little pressure too. You kinda want to do something besides just look goofy.