I used to enjoy the Mel Bay autoharp books, which helped me when I first began to play with my autoharp. So I don’t start with any axe to grind about Mel Bay music, nor with an axe to grind about rights-holders in general. I do think that a user interface that looked better would make me more likely to buy materials on-line.
For example, if Mel Bay had a few public domain pieces on the site for easy download, and then
put its instructional books on sale with appropriate text to explain how they work, in a more attractive format, available to more browsers, that would be good.
I like to imagine that the improvements in technology and development of sites means that someday both affordable downloads and attractive UI’s should be available from publishers–and that when they are, then sales by those publishers on line will increase.