Harvesting doesn't make a lot in NEM.. Been harvesting for about a month with a decent balance and about 80% uptime and only got like 350 NEM in fees...
Don't think I can make a very intersting offer at current prices.

Can you share how much XEM I'm expected to gain from a month of harvesting with 10000?
I'd understand if you can't

You are likely to find maybe 1 block a week with that amount. Than it depends if the block is loaded with fees or not.
I have gotten anything from 0 to around 30 NEM from a single block. Mostly 0 though. And a lot of 6 from the registrations etc.