Very risky abd very low chabce of winninv but he still lucky because they won more bitcoins. But If they lose I don't imagine what I feel I lost more bitcoins. But sometimes taking high risk is getting a high and good result just like the gambling. I don't bet 2 bitcoin in one play only I think it's enough for me to play $10 each play but does not amount of bitcoin.
There are many whales who play in primedice and stake who wage with huge amount of coins and it is like that since its inception and so is the reason they are successful as they are able to attract whales and the freebies they give out to the rest of the users who rarely wage huge amounts is simply because they wanted to maintain the traffic and they are doing a good job to attract huge rollers, so don't be surprised if you see some users rolling hundreds of coins .