Question - I am relatively new to this all, and I have been mining only with Slush's pool since the beginning of September. I started with a GPU miner at first, then I added 9 ASIC block errupters, and then about a month ago I added a 10g blade. My MHash/s rates are as follows:
GPU = 615 Mhash/s
9 Block Erruptors = 3,050 Mhash/sec
1 Blade = 10,331 Mhash/s

I notice at first I seem to get a decent payout, but it decreases over time. I recently switched to a Raspberry Pi unit to cut down on the power consumption (powered by one of the hubs) and I noticed I am now averaging around 0.00058202 as a Payout for each round, where as for a while I was at about 0.00100000. Is the difference the amount of people/devices mining the same pool or is something else going on? Should I expect it to drop down much more? Or is it just always going to get lower and I just need to keep adding?

Sorry if this is not the right place for this kind of questions