I "just" got into Bitcoin this year and also started to mine some BTC due to 3 points:

1. I wanted to learn more about BTC and how it works and also get into it the practical way
2. I do have a PV setup on my roof and therefore some free energy to spare
3. Our electricity supplier plans on taking fees for selling them the "green energy" from my PV setup so I searched for a way to "burn" the energy myself in a meaningful way

ad 1.
I got a Antminer S9 for 100 € and started to play around with home automation to switch it on/off depending on the energy produced.

ad 3.
That's the main reason I eventually bought a Avalon Q miner. The prices I get paid for my PV energy are dwindling anyway and with the additional network fees in the making there's no point in selling the energy.
Although the integration of the Avalon Q into my home automation looks rather difficult atm (due to the lack of SSH functionality).

I won't get rich with it, but I'm working into my own pockets instead the electricity suppliers pockets.