I have some original concepts in mind that I haven't seen elsewhere, but for now, I'd rather keep them to myself. Fairness is paramount to me, especially in creating a game. In my experience with Gambling Math, I've seen how those who build gambling establishments often come out on top regardless of fairness. The mathematics of gambling consistently favors the house.
However, my goal is to develop the fairest, most engaging game possible. Yet, regardless of fairness, my calculations indicate that the house will always have an edge. Such is the nature of the gambling world.
Although the initial numbers don't quite add up to me, I don't believe there's such a thing as patiently playing Crash and building your balance, but anyway. Bustabit is an established platform that has been present for ages and even has its own live chat, highlighting the community and multiplayer aspects of the game. How are you going to differentiate and offer something unique in a game that's pretty much straight-forward? Moreover, Bustabit isn't the only provider that's offering the Crash game; there are a handful of competitors.
You'll also need a lot of money for development and paying winning users, of course. I wish you good luck and hope you'll succeed, but it is a little more complicated than you describe it to be.