Yup. Sucks. .250 shares to .02 shares. Gotta love it. I have found that they usually don't stay long.
Really wish they filtered out big dogs. But owners get their .10% either way so I doubt they will.
you can't limit as they could simply set up 10 wallets and split their power and have 10 x 15 GH/s instead of 1 x 150 GH/s.
On a PROP pool like dbix2 it's not that worse but on PPLNS a nightmare - i went down to 0.036%
at least good that he didn't reduce down to 50k as i suggested or we would just look how others get profit and we mine just to heat up our flats

What i do not understand is why that huge mining farms don't have own pools where they have even no fee - just solomining with their own farm.
True but it would make them work a little bit harder. And usually those types just want to come in big and get out. So making them make a lot of wallets my deter them.