Yeah my guess at what happened there, is that there were quite a few large miners on slush who ordered a lot of miners and finally got them many, many months later.
Here there's only ever been a few large miners, and most everyone else who ever asked me about getting lots of miners, either ended up going elsewhere when they finally got them, or didn't get their miners.

Anyway, as mentioned before, I'll run a no-free month starting soon, til xmas
Hopefully that might change things around, but I won't hold my breath, we've always had the lowest fees of any pool worth mining on