I’m pretty sure that he consume almost close to the winning amount or over just to hit that win with that low win chance rate.
Just normal day for those who have nothing to do with their money or I guess for whom money is just part of the team at Stake.com. Who else would bet $300 per roll or spin if not the rich and those affiliated with Stake.com? People who bet $300 per roll or spin on sites like Stake.com are usually rich individuals, high rollers, promoters or affiliates who get funds from the site or not unless professional gamblers.
For how many years Stake exist and how big their marketing especially on big sports event in the world its not surprising at all that there will be a lot of high rollers will come on their casino will came here and choose to spend their money maybe because they are bored and want something exciting to have fun.
And maybe by betting that amount per roll will make him happy and for people who see it they find it amazing since they can't imagine how that people can able to spend a lot of money just for a single spin or roll since that's a lot of money to lose by certain normal gamblers.
Its just truly a normal day on stake and they are big company that's why we should not get surprised if there would be a lot more whales will come since rich people is willing to spend on something that they think fun for them to participate.