The earnings dont are a problem, in agree of our terms, after march 2018 we will ask a 0.0001 btc fee per transaction, lets imagine 100000 transaction per day for 0.0001 btc = 10 BTc plus the earnings that we will receive with Ads that we will put in our site plus more other things..
And lets imagine how much you will need to spend for three months (before March) if there are many people store their bitcoin in your wallet. Lets just say, you have 10 users with 1btc each, means you have to spend more than $700/day= $21k/month and 63k for three months. That's not small amount of money, I doubt it is a legit offer as it is just too good to be true. Your domain (.biz) is not even showing that you have the money to pay $75 per day.