I have a friend who just bought one yesterday from the largest sewing machine dealer in Portland, and she was able to get the answers to a lot of the questions I was asking, mostly about the fabrics and inks. She was told that yes, she can use her stash of Jacquard inkjet fabric sheets. The printer inks are regular inkjet cartridges you can buy from office supply stores. The dealer told her he wasn't going to carry the fabric rolls, because he only makes 10% on them, but he has to store and merchandise them. Not worth it, in his mind.
So here's my burning question. If the PrintModa printer takes regular ink, and you can use the inkjet set fabrics that are already available, why not just use your existing printer and save the thousand bucks? The only benefit I can see to the PrintModa is it can print 3 continuous yards of 11" wide fabric, whereas in your home printer, you can only do one 11" sheet at a time. Honestly, if I ever needed to print something that is 3 yards (or longer), or I wanted to print my own designs, I'd rather spend $50 at Spoonflower.
Just my humble opinion.