As per your suggestions, we now have increased rates!
Member: 0.0003 BTC / post (0.12 BTC per month max)
Full member: 0.0005 BTC / post (0.2 BTC per month max)
Senior member: 0.001 BTC / post (0.4 BTC per month max)
devthedev's escrow will be topped up today so there is backing for the payments.
you should also provide details like
what is minimum post count per week and max posts per week
also you should increase your budget and put in escrow as 0.21BTC will get you only 210 posts and what if 5 users made this then how other users will get paid