I think that thogh there may be companies looking to make a "fast buck" out of Hendrix's music, many of these releases may be by fans who want to share the music. I hardly think anyone is sailing on a yacht financed by their Jimi boot sales, but I could be wrong.
For a number of years I sat around listening to the official releases only of Jimi's records and then began dipping my toe into the bootleg world. And I found that a lot of the best of his music--for ME, my choices--is in the bootleg releases. So this fuels the search. His live performances can have some spectacular playing, as well as some of the studio jams and new songs he had worked on but not completed to his satisfaction (he was rarely satisfied with playing that knocks the rest of us spinning) or early versions of released material that went in a totally different direction.
I think that Jimi was a real cornerstone figure in a lot of the popular/rock/funk/blues/fusion music that followed, and his efforts are worth finding and digesting and I'm glad there are conduits to hear the stuff. It is enrichening all my musical listening. By the same token, XTC does nada for me, and I don't own a single release. The world goes round in so many different ways.