You're valuing the company/project at 100BTC ($80,000 - $100,000)? Is it already built?
And if you need the money to build the bank, why not make it user-investable like JD/Dicenow? People are clearly dying to invest somewhere and, if your idea is as unique as you say it is, then there shouldn't be a problem building a big bank.
I'm currently working on the back-end, front-end isn't working yet. Investors will get access to my private Github repository.
If you are not afraid of the terminal/console you could actually play already.
It's player versus player, I theoretically could launch the site with 0btc and still offer high stake games.
I don't really need 20btc, my guess is I need about 2-3btc max to launch. But I don't want to sell 20% of my project for 2BTC.
My value is based on my idea, my ability to successfully execute this idea and the fact it will be in a billion dollar+ market.