As orsal commented elsewhere, it hasn't yet come up, and he has the only LA+1 PC around, and he's still just 1st level.
However, it could come up at any moment, if a 6th level PC were to take the Leadership feat and desire a cohort with LA.
I'm not really an expert on the ins and outs of level adjustment, but I think the general consensus is that all races with LA are relatively weak for their designated LA, and that by the time LA can be bought off, the racial abilities are less important than class abilities.
As such, I think we should allow LA buyoff.