NO, low resolution is not low light. it has to do with the no. of pixals. I assume you'd scan your art work and when you can it you scan it at full res. then make a copy in your computer at low res. for putting it online. It someone tried printing it out large enough to use it would be fuzzy or "pixilated."
Many artists I know show their art on their websites or on Facebook this way.
If I sell my work, I always go to a high quality commercial printer so my buyers can get the best and long-lasting professional quality of my images. If you have the professional quality printing equipment and you are skilled in printing, it's nothing wrong to print your own.
From checking out your hubs, you know your Photography, I know my art work is great but just starting out in prints. A commercial printer sound too expensive to just test a new learning curve business out.
Two things spring to mind reading your thread here.
First - putting up low resolution images stops copying - showing some detail in high resolution in company with the whole pic might overcome the "will they buy if they can't see the quality" issue.
Second - there are poster print places in most big shopping malls now - can't you make some kind of deal with them where you sell your work to someone and give them a code - and then print your pic through the poster printers computer without leaving the image file on their computer ?? - ie some kind of online printdirect feed ?
There is an easy way to stop someone from scamming your art work. Make copies of your artwork, or the original, and sign and date them, and then mail them to yourself, or have them date stamped. But don't open it! You can also keep a dated photo-log of your work, and keep it in a safe place.
That way if someone tries to steal your work, you have evidence that it is yours, in case you decide to sue the thief. That is something I learned at an actor/director seminar. Always date your work.
I've heard that in reference to writing, but had not though of it for art. Although, it seems if you have the original that's proof enough. And for my photos they are on my memory cards and in my computer.
As for putting work online you can sign it, and use a low resolution so if they try to print them they will be pixelated.