What would you consider high poly? 12 years ago cars that had 5k polygons were considered very high poly. Nowadays, hardly anyone bats an eye when someone makes a car add-on for GTA:IV that has around 100k polygons. Models with 10k polys are still considered as low-poly nowadays.
It's not really the polygon count that matters. It's the art style.
I used to talk about this with Kaje. I kept asking him how many polygons should a model be. He always told me that it should be as many as the model needed.
Thats very true, at least the part about it being the art style.
In the case of Blockland (we have sorta a.. Community defined art style)
I would argue that polycount plays a role in blockland's art style because our art style is community driven. People rather enjoy models that look like the belong together. I've made add-ons with higher poly counts, but they still retained their blockland feel. So i understand that. Its a tough subject, defining our art style.