Very good question, thank you! The reason I’m doing this is for me to have fun, experimenting and learning about mining and blockchain. Also talking about my mining adventures with other Bitcoin enthusiasts and writing about it here on Steemit. In short: it’s a hobby, not a business. It would also cost me if I collected physical coins or post stamps, for example.
And yes, you are right: I am considering selling the miner at some point in the future. Possibly for 25%–40% of the original price I paid for it. So the mining itself doesn’t have to be 100% profitable. 60%–75% would also be sufficient. And the amount of fun and learning I’m having is definitely worth more to me!