I really confirm BUU's position here (and following discussion) and will add something to his sayings.

while many people tend to say that XP does not matter, they actually do not think so. They're lying to themselves! I know this feeling!
Yes, when you have as much XP as 400+ you do not really bother about a few XP--.

People tend to say that they do not bother about money if they have them enough. Also they tend to say that they do not bother about money when they do not have money at all.

This is not a overall analogy, but when you'll add some other functionality, as allocating several resource for XP, and exchange XP for some help from other person, you'll see something dfifferent.

After thinking about this, I can say that currently XP system is like a communism:
 1. Everyone gives what it wants, no pay (he gets answers to his questions)
 2. XP number does not matter, as money do not matter in communism society
 3. Despite of said before, while XP does not matter, persons with many XP points, among equal ones inside society, are "more" ones than anothers: they have power to analyse and "repress" them.

I lived in USSR and can confirm many similarities to it.

Do I need to explain why I'm here as "Anonymous monk"?

mass "--" thus leading of decreasing of XP is of no concern here, I'm not bothering about XP :)