Something I just thought of, in the demon sands they have those tokens you can use to buy various weapons, armors, and jewelerywith that range from min level 6 to min level 12. What if they did that for say gianthold, orchard, vale, reaver's, and shavarath.
As none of the mentioned places have named items from monster rare chests like the sands do I don't think it would be all that game breaking
Giant hold copper tokens: min level 11 to min lvl 14 gear
Orchard: silver tokens: min level 11 to min lvl 15 gear
Vale gold tokens: min lvl 13 to min lvl 16 gear
Reaver's refuge platinum tokens: min lvl 14 to min level 17 gear
Shavath battle metals: min level 15 to min level 18 gear
Naturally the higher level the items the more tokens it'll cost to get the selection which I believe would make the slayer zones a little more desirable as some times you get skunked in rare monster appearances. At least this way you're also gaining some sort of profit with your efforts.
Thoughts? Questions? Comments?