It wasn't grinding. People played more than you because they had fun, and they retired at level 31 because there was nothing else to do at level 31 unless you were a grinder who wanted to grind to level 33. So in fact the people thatr retired more often were the non-grinders who wanted to try new builds rather than grind levels. Your logic fails magikarp.
It doesn't, a smart math addict actually pointed out that retiring made the way to 33+ levels much faster than doing it all in one go.
I have fun too, but Im a human being, I play as a casual player. Yes, hardcore players who play for nothing but rewards should get them. But in this way players who grind the crap out of the game when exp is too easy to gain, get rewarded too.
Btw, 6 is an example. I would love some sort of cap. You got players receiving over 15 heirloom points, and that's not wrong according to you?