I was wonder if a BoolValue could save and load like leaderstats. Say I wanted something I upgraded and it would be a BoolValue to save when left and load when joined.
http://wiki.roblox.com/index.php?title=Data_persistence
They also explain about storing bools at the end of the article.
You guys should REALLY use Data Stores now. It saves instantly and you can get the data of people not online. I suggest having the entries be the player's UserID then followed by the name of the data.
UserID .. "Cash"