Whenever I have the offer of a paid collab, it's a case of weighing things up.
I have a part time job that makes up most of my income, and I have a webcomic I really love that brings in some supplementary income.
If I want to make another comic, I would need to stop doing one of those things to have the time.
So this means, in order to replace my job, the comic needs to pay at least as much as my job does (this is unlikely. Edutainment is a much more lucrative field than comics), and it needs to be guaranteed as either a long-term project, or it needs to feel like an investment of time that's more worthwhile than my webcomic.
Obviously the webcomic would be the more likely candidate to get put on the back burner while I do a paid commission, and so it becomes a question of: "Do I feel like this is more worth my time than making Errant?" It's not impossible, since Errant has just a modest following and makes just a modest income, that if somebody with a history of making extremely good and popular comics and who had access to a much wider audience than me, approached me with a banger of an idea, I'd be like "Okay, I need to put Errant on hold for this, I can't miss this opportunity!" ...It's just unfortunately pretty unlikely. Errant has over 2500 subs and a place on the creator bonus program, so whatever somebody's offering, I need to feel confident it'd perform significantly better than that, or at least get me something valuable like a foot in the door with a good publisher or something.
Sadly, in the vast majority of cases, even with offers from professional people now, the answer is "no, this isn't a step up from what I currently have"... but I'm open to the possibility.