The obvious answer to the above question is that a) we need the money, or b) we need it to buy more photographic gear, perhaps gear our spouses wouldn't approve of otherwise.
Perhaps the more important reason is that is that someone paying for our work is a very clear message - our work is worth while (well, unless it's mum).
So, if the hassles of setting up e-commerce or accepting credit card payments and dealing with unhappy customers and failed transactions seems a lot of bother (it is), then maybe it's time to think of giving your work away.
Think about it.
What if you placed your work into a pdf, large enough images to really enjoy on a typical modern monitor, say something around 1200 pixels wide, 900 high, and either use your own website servers or a service to maintain this pdf file.
You then let everyone know that your work (perhaps a sig. but not complete part of your work) is now available, for free, to download. You set it up so people do have to give you their email address, and make it plain what you will and won't do with that address.
You now have a way to track downloads and thus interest in your work, which was after all what you really were looking for when you thought to charge for it. True, people could share the downloaded pdf file, and you can't track that but that's ok - no saying where the exposure might lead.
Now, to be blunt, I haven't tried this, but it's something I'm thinking of.
I did think of an ebook but it occurred to me that a book of pictures wouldn't offer anything that a website wouldn't so expecting people to pay for it seems rather silly. No, for people to find a book worth paying for they'd reasonably expect more, and that's a topic for another day.
In the mean time, I'm interested in your thoughts about this idea, pros and cons.