I have been a bitparking (http://mmpool.bitparking.com/pool)  miner for a while, but the raise of the PPS fees from 2.5% to 5% made me look for other options.

Eclipse Mining Consortium (https://eclipsemc.com/) appears to be having a 0% fee on DGM shares.

If so, why do other pools impose any fee?

Why do miners are willing to pay a fee for participating a DGM pool if 0% DGM pools are available?