depends on the stage of the game, within the first few weeks its almost impossible to be top 20 without heavy pp expenditure, so assuming people judge each other with at least thier own standards in mind, thousands and thousands of pp would be deemed fine amongst the top rankers.
for other peoples opinions i imagine its a very perspective based thing, if you dont use pp at all then your likely to draw a line in the sand n say any pp spent is baaad
if ur a moderate user your probably accepting of those who spend nothing, totaly down with moderate usage as you yourself are that guy, but proly still cringe at those chucking 20000 pp at a world for rank 1.
The only line ive seen kinda develop amongst heavy pp users are those who purchase 10000 pp to do well on a world, and those who generated 10000 pp via previous worlds selling res, with the latter being a tad more "respectable", however thier is always the hard liners who will correctly point out if it aint rule breaking its all good.
Personally i think we all set our own standards of play, ive always been a opponent of pp expenditure and imagine i always will be, dont get me wrong, ive top 5'd in a pp world with 0 pp expenditure vs heavy users, and ive also halved or even quartered (cuz lvl 30 farm can just go die) buildings where ive not been chasing ranks at all, but ive never been a silly spender and would totaly advocate for removal of micro transactions (never gunna happen) or just the occasional non micro world (highly doubtful)
pp sucks, but thiers still plenty of dummies to berate so if u wanna chuck a 100 pp on them final farm n smith lvls, thiers bigger fish to fry