Winning gambling strategy...
Hit a casino around 11pm. Be good at poker. Have a big enough roll to handle swings at your level.
Watch the tables.
You want to find drunks, tourists and gamblers, you don't want to sit at a table with other skilled players.
You can't beat the house long term at anything legitimately.
Roulette would require a fixed wheel (maybe shady dealer IF they can manipulate the wheel, but I doubt that).
You can't beat BJ without counting. Counting down an 8-deck shoe (which most are, or they change the odds to make up for it) profitably. You could also find a dealer who will flash their hole card but it's highly unlikely and if you did find one it wouldn't be long before they get caught.
You can't beat sports without inside info or arbitrage betting, the latter being when you can find 2 lines to bet on that are different enough to give you an edge.
Re: Bonus Whoring. Back in ~2003 it was legit. Casinos where offering insane bonuses because it was so competitive.
You'd simply calculate the bonus and the wager requirements. Sometimes you could catch a 30% edge.
I won about $5k over a week. All playing BS blackjack, and probably $4k of it was the actual bonus money. I hit up about 15 casinos to do it, and put in ridiculous hours with maybe a ~20% edge with the bonuses...
So even with that edge variance could have wiped me out.
I doubt you can find whoring opportunities like that today.
This much I do know. Most pro gamblers I've read about lived shitty lives. Back when you could still count cards, and get maybe a 5% edge in BJ, the guys I read about slept in vans, never tipped, ate peanut butter sandwiches and grinded ridiculous hours to make $100 or so a day.
Even pro poker players, who are like superstars these days, most of those guys have gone broke more than once.
I remember reading about Stu Unger, arguably the greatest poker player of all time. Back then everyone was a fish. The games were nothing like they are today.
He'd go into a casino on a stake because he was broke, win $100k, go get coked up, come back to the table, lose it all and end up even further in the hole.
Dude was the greatest of all time and spent the last years of his life broke and begging for money.
That has more to do with being a degen than anything, but still, with VERY rare exception being a pro-gambler is not a glamorous life.
Be thankful for interweb moniez.
-Scott