That is incorrect.
If the overall rate grows you are still compensated the same.
Easy example;
Day 1 - your the only miner in the pool with 1TH, you earn say 0.3 BTC per day and you own 100% of the hash rate.
Day 2 - now there are 4TH total, meaning you own 25% of the overall hash rate, BUT your 1TH still makes you the same 0.3 BTC per day
The only way this changes is when difficult jumps, as you would then earn less per day...
Cheers,
Of course on principle, but I believe there are variables, i've reported pool flux many a times already, as in, a 1PH behemoth pops on and all of a sudden my hash reporting goes bonkers, usually dropping.. It eventually stabilizes but this happens throughout the day now that KNC and others pool jump too. (and that would be across the entire pool..) I'm assuming servers get overloaded no matter how much headroom you have. Until I'm told this can't happen. I'm believing it does.