Normal people refuse to learn markdown - they want RTF editor.
I could understand someone might refuse learning LaTex but markdown is so simple.
RTF editing sucks badly if you have to include it in your project. No one wants to specifically pay for implementing it but they also expect it to be there.
Nowadays you can just use one of those WYSIWYG markdown editors that come with a toolbar (incl. buttons for inserting images) and hide the formatting syntax by default.