As someone who hasn't published anything for SailfishOS (except for one tiny tool I made around Christmas hidden somewhere on github, it's not quite ready, so no announcement to make) at all:

You could say I am climbing the mountain the same reason MartinK and Captain Kirk do it.
I have been 'on and off' scripting for mobile since I got the N800 way back, but only out of curiosity and never to actually release stuff. That way I've learned about GTK, Python, SDL and loads of other stuff on my mobile Devices. Just like having… my real Computer, but smaller and really, really slow! Awesome! Joking aside, I love having the ability to just spontaneously dig in and learn about how things work, even if I choose not to – so naturally I went with more or less the same system I always used on the big machines.

The Jolla marked the first time I thought "wow, I'd love to [verb] [pronoun] [noun] with my Phone", knew it should be pretty easy to do* and have the feeling that work could be benefitial to others if I shared it. Even if it's only one other Person. So I am going to eventually.

I don't care about Harbour for now, because I see it as a hassle. I don't know exactly which QML-Components aren't allowed (I know GlassItem isn't. I love GlassItem. Also, I started using it before I knew.) or what other policies there might be for not allowing it. Also I feel it would be a waste of a sailors precious time if I just submitted anyway.

I might look into OpenRepos, but didn't have the time to investigate yet. I'm more of a repository guy than an app store guy anyway.

*) My Python (used for Chinook/Diablo/Fremantle) is way worse than my JS, even though I don't know QML much.