NL25 will already suffice once a bunch of $5 chips land on the table from rebuys. Not a load of profit to be made with an average production cost
CPC $5 chip, but hey, it's still a profit.
Trust is a nice thing, but there's a saying that where money begins, friendship ends.
Using UV on cashout is a good start, it protects your bank, but not the players however. Suppose player A who snuck the chip in put it in a pot he lost and the chip ended up in B's stack, who then gets unjustly shorted on cashout while bad boy A gets away with more than he deserves, and incognito.
Catching it at the very time it is attempted to be placed on the table for the first time would be the perfect achievement. Under normal circumstances that'd be hard if not impossible to pull off, but you could very well effortlessly do this by playing Cosmic Poker as mentioned. If you mark the rolling edge, it will instantly be visible to everyone at the table.
Of course you'd have an even bigger incentive to play like that when you have a set where clay colors were picked with UV in mind
Show off your glowing chips, prevent money loss at the root. Two birds one stone.