Maintain a fund for my “personal interest” - be they gambling, collecting, whatever I enjoy.
Funding mainly self generated - I gamble and win - put money back. I decide to part with something - back to the account. Generate some additional cash via participating in class actions (spotty payouts and never really know when you will hit a big payout), bonus whoring banks and credit cards (drying up these days - rarely get any offers now but in the day) and whatever other offers I can find.
At one time - used to use bonuses from work - these days I send those straight to the Roth account and company stock purchase plan. Got to a point where didn’t need the funding and buying company stock at 30% discount was better deal (plus pays a 2% dividend).
Like the bank sign up offers - days of bonus offers offshore drying up to nothing - but still regularly get “no lose” offers from DK for example on NFL games - found the best use of those is betting the ML dog and playing other side elsewhere. DK loves to see a loser and your getting your bet back in unrestricted free play so can use on big ML dogs or futures - which are useful in clearing cash elsewhere. Still a few books offering decent bonuses these days worth taking - but a few to steer far clear of or be prepared to lose your balance with.