If you don't hit 9ch then your hardware is so weak that you find no blocks. If you find no blocks for the pool then why would somebody give you 6-7 XPMs/day for no value you bring? How can it work on beeeeer: you find no blocks and they give you 6-7 XPMs for that? Is beeeeer charity or what?
There are thousands of small miners. They find blocks just as fast as a miner who has thousands machines. If the pool under-pays the small miners, the small miners contribute their time to the block finders most of the time.
In my case I've found 3 blocks for ypool since Sep 23. Ypool paid out about 20 XPM using their value system.
In total I have been paid ~70% for the blocks I have found.