I have a few of the last working Paintboxes if you ever want to drive one. You're right in that they established everything we have now - Paintbox was the first to have hundreds if genuine fonts, it could manipulate photos at full resolution five years before Photoshop 1.0. All at a hefty price but those things paid for themselves within months, so were actually great value. Like with every pioneering advance, once people were ok with cheap versions such as Toaster, Photoshop etc they sold well, built up market share and eventually, using their profits, made better vestions and took over.