in reply to
Loss of experience points seems inconsistent with reality
Losing/gaining points means nothing. The XP system is used to determine the quality of a writeup through the use of user-submitted votes. The graduated system of personal experience is directly (yet not, see 2 XP points for signing in, etc) related to the content you share on Perl Monks. If you have a low XP, it doesn't mean you know nothing; inversely, having 3000 doesn't make you a Saint, either.
I hope you get the most out of Perl Monks.
John J Reiser