(Thanks to various commenters for adding to this list!

There is a chance for...
* Archeology to give you expensive Simerian Keys
* Balloon Burst to give you a Capsule Machine Token
* Fruit Machine to give you 50k
* Genie to give you 25k
* Gumball Machine to give you 25k
* Jackpot Pyramid to give you Kamilah Codes
* Mummy Multiplier to give you runes
(not to mention the 1000mp tomb that makes the MP non-negligible)
* Snap to give you Blue DNA
* Spooks Busters to give you poison
* Test Your Strength to give you 1m
* Undying Fairy to give you 1m