I'm gonna go with the quality over quantity crowd here, but with a twist. I've been up to as many as 10 at once, but that was before I got my first PCP. I currently have 2 in my possession, with another on the way, and one up for sale. I seem to be unable to totally give up on springers, but I don't tend to keep them very long. And even with my PCP's I'll buy one, shoot it for awhile, then sell it or trade it off to get a different rifle. For the most part that works okay, although I do regret selling my FX Cyclone. Gonna have to replace that one some day, it was a keeper that I didn't keep. My AA S200 is in that category, that one I intend to be buried with :-).
But I like to have a variety, even if they're all PCP's. Once the new one arrives, I'll have 10, 20, and 40 fpe rifles, so I should have all my bases covered. That said, I suspect that all but the S200 will be looking for new homes sometime in the next year, maybe to help finance a replacement Cyclone :-). At which point I'll have everything I need in two rifles, not sure what I'll do then to keep from getting bored. Maybe start playing with big bores :-). Later.
Dave