Since it was asked here - I imagine there's a better chance of somebody responding if the notebook or question title is engaging. Or if the content is more interesting in some other way. It's basically competing for people's attention.
I don't expect people to answer my own questions here if I don't put effort into it myself first. A lot of questions have the title "is this correct?" or some equally vague variation, which I imagine just encourages people to keep scrolling. I'd look at whose entries often enough get corrections or feedback. It's not for no reason. But I'm sure some good posts get bumped off the front page and lost.
If somebody has a question about a sentence and doesn't understand something, then it'd help if they maybe explained how much of it they already understand, or think they understand. Or whether they need a huge in-depth explanation of the whole thing.
Also, when people post long notebook entries in the form of a "question" on this site, then that's another thing to just easily skip. At least it's much more effort than it can be worth that way, since you don't have any proper markup tools.
Anyway, those are just my impressions of why it might be hard to find volunteer help sometimes.
