It's not intentional.... It's because of quicksynth.

Quicksynthesis is designed to que up large numbers of some mundane item you need to make other things and go afk. I mean I for one am not going to sit by my PC and watch my tune mindless make 99 bronze ingots. I quicksynth them up and once it starts I go afk, watch some t.v., etc and come back later.

These people are going afk for the quicksynth to finish and coming back hours later. It's not really there fault their not being kicked. We are not exploiting it, we are crafting, it finishes, and then are tunes sit there afk not getting kicked.