I do think posts with pictures are more appealing. It's as you say, text posts get ignored more easily, so I'd say it's worth it.
It doesn't have to be much work. I just picked the header from my blog as an image for all of my just text posts. It's my own picture, so that makes it easy. I put both header and source text in a notepad file for easy/copy pasting :-)
I've suggested we should be able to set a standard signature block for our posts and that could include images. It just saves a little work each time
That's a good idea. Just have a basic signature and add any other source references to that.
That's an excellent idea - to use a default image/MD template for default 'blog' posts. Thanks.