Bane will pretty much be the same as usual.
It's part of the funky nature of the tags but shortest explanation is Bane itself is not a curse but inflicts curses.
It's kind of like how mines are considered spells but because they are also trigger skills and ergo "cast on" support gems don't affect the actual mine skills.
It's part of the "not so great" necessary knowledge for game mechanics in PoE.
Like auras and curses are categorized as spells, but do not benefit whatsoever from SPELLpower.