Lucky this time, I managed to turn the $15 bonus into $100+ and withdraw it straight away as I do not want to spend to much time on gambling.
Wow, that's a great win, my friend, as you can convert your bonus into a larger balance for withdrawals. I usually have a hard time converting bonuses into winnings; for some reason, it seems even more difficult. I've only managed to win the bonus amount a few times.
As a rule of thumb and to commit to stay away from gambling addiction, I have always seen bonuses as money which is already burnt for fun on the casino, to be honest. I have even less expectation on bonus money than actual deposits I have carried out from my own external wallets.
I would have also felt extremely good and lucky had I managed to get such multiplier out of my bonus.
Though, lately I have tried to limit my wager so I guess I am not elegible to get any significant bonus from Stake or other casinos which try to keep their gamblers engaged though those marketing and promotions.
Anyways, one can only hope people who manage to get money out their bonuses withdraw all of it and can get some pleasure in the real life with it.