@Mahdirakib, @Dewi Aries, @entebah,
Thank You very much for the honest answer of my question! Obviously, You are correct. As I have suspect, the biggest rollers at Stake are Casino's players.
I am not sure which profit they have, maybe there is some secret or let's say it strategy to wager without much loss or bonus to compensate the loss from the wagering.
Obviously as a sports bettor I have no chance against such a "sharks".
@Dewi Aries,
wow, $89600 in three bets under one minute, as I can see from the screenshot. That's a wagering, indeed. Sadly, I have not won a lottery to bet with such size of bets for now.
Anyway, in case my betting limits will be cut seriously, I presume the only possible way to continue wagering will be Casino. Is there some way how to bet there in order to continue grow up in VIP levels without a significant loss?

Thank You, mates!

Regards,
barbaron