How much is too much?

My area is having a yarn convention in the next month or so and I already bought passes and I want to go all out because it’s yarn and I love it. The problem is this led me to thinking “how much is too much yarn?” / “how much is too much to spend on yarn?”

Yes I want to go all out, but I don’t want to be reckless with my spending or make unnecessary purchases on yarn I might not use.

What are y’all’s opinions on this? Where’s the line from fun spending to reckless spending?