From my personal experience I would say that winning 10 times in a row with 1.9 odds is really a tough job
If the sportsbook fee is 5% then it would take an average of 1024 days with a normal betting (can be earlier if you have a great luck)
Well, you're forgetting that you are making bets and are getting paid out on them when you win.
So, if we assume that you are only losing the vig (breaking even on 50-50 bets and losing the vig), and every bet is a 50/50 shot, and the vig is 5%, you'll have to wager 8.88m
BTC 1024 times, on average, to win the main prize. That means that you'll have to wager 9.09312
BTC. With a 5% vig, you'll lose 454.656m
BTC and will win 510m
BTC in prizes (it doesn't say in the rules if you can win the 10m
BTC prize for five in a row multiple times, so I assumed you cannot). With the prizes, you have to roll them over 4x before you cash out, so that's another 2.04
BTC wagered at 5% vig = -102m
BTC.
So if you are a breakeven bettor, you'll lose 454m
BTC, make 510m
BTC in bonus money, but you'll lose 102m
BTC before you can cash that bonus money out. For a grand total of -46m
BTC (and two years of your time) in equity.