No I agree with Biffa.
It's about getting the hash rate up a lot.

While adding losta small miners means more hash rate, we don't want to fall behind the Diff rate rising, we want to get ahead of it a lot.
The only way I can see that happening is getting a number of large miners on board - but that wont be a lot of miners.
This will only attract a small number of miners, but make a big difference to the pool if we do get some.

Biffa's idea works also, but I don't think everyone is trying to keep up with the Diff changes, so we need to keep ahead of them somehow.