Hell no. I'd never use a pool with so high fees
I was 'donating' 2.5% for the invalid blocks anyway, this 3% fee isn't so bad 'cause the blocks get found fast. I couldn't believe this (block found in 18s):
07.07 02:04:28 0h 00m 1 17493 0.00277254
07.07 02:04:10 0h 07m 33 580062 0.00275919
blocks getting found fast doesn't matter in the long run... it evens out.