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NOW INQUIRING INTO DQXI Casino Strategies.
Also, solved the crashing problem. Somehow all my graphic settings got bumped back to their highest settings and my system was choking.
Ah, glad it worked out.
Buy somewhere between 200 and 1000 tokens, whatever you can afford and feel comfortable with.
Play Poker and double or nothing each time only to a max of 3 or 4 guesses before taking the wins.
Reset if you lose everything.
You could play Slime Quest Slots as well, but it's not very lucrative.
Do note there is a bunny girl in both casinos (only one in Act 1, 2 in Acts 2 and 3), that lets you know which Slime Slot is hot or not, and another called the Jackpot girl, who tells you what the value of the jackpot is (max 1m), and another who gives you a hint on the best slot.
There's a special item from DQ2, a Tombola Ticket, you can find on the casino floor, it allows you to play the DQ2 lottery game for actual Gold prizes. I suggest playing it a bit if you're low on cash to trade for Tokens up front. You can't miss it, it's near the bar on the left on the casino floor (or the right if you're on the floor facing the stairs to the exit).
Save again at 3000 ~ 5000 Tokens
Automate 10 token slots. There are a number of ways to generate automation on PC. Let it run as long as you want, getting as many tokens as you feel you need.
The only item in the first casino that offers a good resale value, is the Mercury's Headband. Later on, in the second casino, you can exploit Sage's Elixirs for infinite Gold (9 at a time, unfortunately, but it doesn't take long to buy 99, then run down to the nearest shop to sell, and return to the casino, to repeat until you're satisfied).
For 100 token slots in Act 2, you'll want to keep at least 30,000 tokens, though I recommend 50,000 as a decent cushion should things go wrong. 30k is sufficient, 50k is if you're a magnet for bad luck.