I suggest you read and understand the wiki entry for gamification. The facts reported by Your_Mother show that people who have been here much less than you (in one example 4 months) have more XP than you, which proves your argument of discrimination to be false. If people expend more effort in something they tend to reap the 'rewards'. XP has no tangible rewards, consider it a fairly meaningless virtual badge of honour. Few privileges are gained after the very early levels. Acquisition of XP is a by product of helping people and making a positive contribution. If this is your goal consider spending your time in a manner that will gain you some.