Thanks for the help!!! A simple 1 month spread sheet with 1 S9, like swanny88 did, would be great. Since alot of people use S9's it gives people a good base to start with, when comparing their equipment. This way, it could help people with X amount of S9's or similar hashrates.
I would think that a rolling 30 day average would giver a better idea. I´m not so sure that folks will understand the low numbers at the start of a month. The start of this month would have looked horrible with the two 300%+ blocks, and if not interpreted correctly, may dissuade new members.