You know, we all jump in and give folks three hundred reasons why they shouldn't quit, but it comes down to this: If you don't enjoy it, quit.

You've made a small profit while pursuing a hobby. How many people can say that. While others invest money in their hobbies, we sometimes profit. It sounds like you play at Low enough stakes that you can justify your costs as "entertainment costs"... so when it no longer entertains you, don't invest in it.

If you're still having fun, keep playing.

It's really that simple.