The honest reply to "How much do casinos pay out?" lives in the general terms. Beyond the bonus pages, every casino has general terms that govern the account itself. They decide what happens to a balance left untouched, when a bet can be voided, how much can be paid out on a single win and on what grounds the account can be closed. These clauses apply to every player, bonus or no bonus, and a few of them can cost more than any single promotion.
An account left without activity for a set period, often twelve months in a row, is usually classed as idle. Many casinos then charge a monthly administration fee against the remaining balance until it reaches zero, sometimes after a single email warning. Logging in may not count as activity; a deposit or a bet often does. Withdrawing a spare balance before stepping away, or closing the account, avoids watching it drain away.
General terms also limit accounts to one per person, and often one per household, address or device. They can be changed by the casino, usually with notice by email or on the site, and continued play may count as acceptance. A governing law clause names where disputes would be heard. Saving a copy of the general terms on the day an account is opened keeps a record of the version that applied from the start.
General terms allow a casino to void bets placed on an obvious error, such as odds or a payout set wrongly by mistake, often called a palpable error. A separate malfunction clause voids all pays and plays when a game fails, and the stake of the affected round is normally returned. Both clauses are meant for genuine faults, though their wording is broad. A win that is voided should come with an explanation that points to the clause and to the round concerned.
When a game fails, the clause voids all pays and plays in the affected round, and the stake for that round is normally returned to the player.
Usually at its own discretion, most often citing duplicate accounts, false details, suspected fraud or a breach of the terms as the grounds.
Many cap payouts per win, per day or per month; jackpot networks usually sit outside the cap, and a large ordinary win may be paid in instalments or cut.
Normally yes, unless the terms allow part of it to be withheld, for instance winnings linked to a breach; the terms should explain how to withdraw afterwards.
Yes, usually with notice by email or on the site, and continued play may count as acceptance; saving a copy at signup keeps the original version on record.