As Bobsix stated, the WIN chips are an advantage for any table game player.
They are non-negotiable, meaning that they play the same as any other wager, and if you win, you keep the original chip and get paid with a "regular" casino chip of equal value. If you lose, they take the "Win" chip.
Usually they can only be used on wagers paying even money. I know I've tried many times to place straight numbers on roulette with them, or prop bets at craps. Only once did a "novice" dealer accept my wager on roulette with the non negotiable chips, and unfortunately I lost them all on one spin.
The "EV" percentage on non negotiable chips purchased at discount ($10 gets $15, $20 gets $30) is pretty good. It's "on my list" of things to ask for whenever I visit a casino boothling. (Fun Books, Win Cards, Free Buffet, Gifts, etc)
Used to be a program on the South Florida casino boats that allowed the purchase of $100 ($10 minimum bet) or $250 ($25 minimum bet) at a 25% discount. I spent over a year going "boat to boat, often cruising twice per day, to take advantage of that deal. EV on a $250 purchase was nearly $65.00, plus other perks such as free sailing, meal, snack, booze, and coupons for slot token bonus with purchase (buy $20, get $30), etc.
I'd even go out of town to the keys overnight (got a room comp) or Port Canaveral (w/room comp) to participate in that program. The company offering the deals was called "In Good Taste" (now defunct? Don't know, the casino's eventually dropped out of the program.) and was a membership thing that is difficult to explain. Cost was maybe $50/year.
Sure do miss "those days". Average cruise was 4 hours, they all had poker rooms, so I'd "gamble" until my NNS chips were converted, than play poker.
And if it were still in effect, I'd still be living and "working" the program. Average "win" for those 4 hour cruises was well over $60+ comps.
In addition, most allowed "A" VIP players to purchase $1000.00 in chips and receive a bonus of 4 x $25.00 match play coupons. And most sent out free play mailing monthly.
Ah...... the good ole day$$$$.