The 2.5 - 5 BTC in Rake per day, to me, definitely needs some further insight. I follow you guys passively and you seem to have a big challenge getting traffic, and if there is action it's 99% freerolls.
With the 2% rake that would mean you have a minimum of 125 BTC worth of rake-able pots/mtt-fees per day. To be honest I have a very hard time seeing how you would come anywhere near that amount?

I also feel 4000 BTC is an awful lot of bitcoins (and an even crazier valuation) to ask for just a "brand". As I see it you don't have any significant traction & you don't have a product. Or at least you don't have a product that you feel is valuable to carry the business forward seeing you require the bitcoin to acquire new software.
How much does Enterra asks for the software anyway?

Before you start asking for 4000 BTC, you'll need to (1) expand a bit on your current assets, revenue, growth, .. (2) convince people why you feel 20K is fair, cause that's one hell of a valuation