Okay, after translating the post I can give a feedback by myself. :)

If you post via busy.org the upvote you get is randomly. It is not always 0,3 $.
Sometimes it's more but mostly less.

Then as you said you have to have fun writing your posts.
But you have to remind that quality content is very important.
There is for example the tag #steemstem for science posts getting voted highly if your post has the necessary requirements.

Also it attracts followers interested in your topics.

But don't look at the money. Steemit should make fun. Steemit should not make you rich.

Greets Naturicia