I've been buying Magma channels for maybe a year or so now, but yesterday I finally sold my first one. I run a remote lightning node to be self-sovereign, not for routing fees and what-not. HOWEVER...this one transaction did, in my case, pay for everything I've invested into my node! I'm not including hardware here, which I already had.
My total gross profit after on-chain and Amboss fees was about 10% of what I put in the channel, which I committed to keep open for a month. ...and unless I read something wrong, I can still use all the sats, charge routing fees (below an agreed-upon amount), and stay in good standing. I'm just committed to keeping the channel open. This kind of feels like free money, even though I know I'm providing a service for someone.
Probably most encouraging of all, I thought I had done something wrong at one point, reached out to the Amboss telegram group, and @jestopher was incredibly quick at addressing my concerns.
All this to say, if you're like me and have way way less than a whole coin in your node, I can testify that you can still make some sats selling a channel on Magma.