Getting to be more and more trying to hide than there is cover. What I'm saying is that when all the 400-1400's drop to farm, the hiding won't be what it used to.
For me, it depends on how much stronger they are. If L10=3250 for 1M. Then unless loot is fixed, I'm not really going to bother with them. 3500? Maybe. 4000? Gimme gimme.
Definite interest, but loot has to be fixed up there first, and that'll be done by fixing the problems which are forcing players to camp at the lower levels. The last three times I ventured up into 400-600 land, it took me 100-200 Nexts to find a base with a) above break-even loot, and b) that I could actually beat.