If vets can grind absurd amounts of LP from quests (and this is far from certain after OP's LIES) then the solution is to add diminishing returns/caps to quests, not to dodge the problem with temporary invincibility to noobs or other such crap

I wonder if the master (results = sqrt(effort)) equation applies to quests? Do I get 2x the benefit from doing 4x the questing? Because it should be that way.