If they don't put a cap on tomestones then some people would grind out all the gear that they wanted in a matter of days and then complain about there being a lack of anything to do because they're already geared until the next major patch adds new dungeons, raids & gear.

While it is an artificial addition to this patch's life, do any of you really want to see daily new threads of "THERE'S NOTHING TO DO BECAUSE I GOT ALL THE GEAR I NEEDED IN A COUPLE OF DAYS"? Be honest, you don't.