This has an awkward ring to it. "All the things" doesn't seem to have much application in the English language. Maybe "These are all the things I like," but the domain doesn't elicit that type of impression. In fact, I had to think long and hard to come up with something that had "all the things" in it that made anywhere near sense, and that's what I came up with.
I'm even surprised that allthethings.com was registered by one of the big domain investment companies. It doesn't seem like something they'd really even think of regging, and the links on the parked page doesn't seem to know what to make of it (it's filled with PlayStation links...) If I wouldn't buy the .com, the .net's going to be even lower in value.
Reg fee or less. Sorry, and good luck!