What's interesting to me is that on a mush we really could do a 'average' xp of pcs on the grid. Code could take all totals and average them out and that is how much you get to start with. Or a Mean.
such a system would work best with a mush with slow xp gain, and high PC turnover. Either with a lot of PC death, or xp caps that when someone gets so strong they move on from this area. Or other methods of pcs being retired frequently for more than just players hopping concepts.
I think that would be a fair system, so that you aren't tempted to just reroll anytime you get gas, but you aren't punished by having to start completely over.
Of course, you'd also need a steady input of low xp characters. Newbies who have to start at cgen or cgen+10, or only restrict such roll overs to pc death or retirement (permanent)