Does it make sense to publish papers/ theses online? I've left academia for business some time ago. However, it occurred to me that I could publish some of my old final papers/ theses online as online books. 

I have all the copyrights. 

The theses are good and I could probably publish the most recent ones in "traditional" publishing houses, but with my new job, I don't really have time for several rounds of corrections and re-writing of old papers.

These are papers with implications for the practice and on topics "general public" may find interesting. What I mean in this post is, obviously, not "scientific publishing" online, but non-fiction publications directed at general public.

My goal is to earn a bit with the texts. I don't really need a list of publications for my current career, although it's never a bad thing to have some publications I guess, so if the publishing "channel" is not completely ridiculous it's even better.

Have you had any experience with self-publishing online? Does it make sense? Or is it useless work? 

Edit I don't see much point in discussing whether the papers are interesting/ valuable/ up-to-date or not and I'm a bit surprised that this topic has been raised at all. (Because I would expect a bit more scepticism concerning making assumptions on details not mentioned in the initial post from academics). Instead, I would find it interesting to hear from someone who actually has had some experience with self-publishing their work/ academic work online. That's the point of my post.
My goal is to earn a bit with the texts


My understanding of book publishing is that making money is really hard, and even harder if you do not have the backing of an established publisher. Established publishers often have contracts with university libraries that guarantee them a minimum number of sales. They generally like authors who will then teach off the book which gives them some more sales. When the author convinces colleagues at other schools to teach with the book also, profits can be made. You do not seem to have that type of network, so I doubt you will make any money.

The hit rate of established publishers to actually turn a profit is pretty low. With their network and approach, their costs are generally covered such that a couple of successful books is all they need. This means they scoop up anything that even remotely has a chance of being profitable.