What I'm leading into in this convoluted analogy is not DUERRR BON JOVI BETTER BAND THAN THIN LIZZY CUZ DERP SALES LOOK HOW MUCH SLIPPERY WHEN WET SOLD IN 1986 ALONE....but, while I may not have listened to the broad-base of artists in the whole spectrum of genres someone like George or Matt (a compliment, btw to Matt) has, or other people on babble for that matter, I've still listened to and sampled more than 99% of the population and long ago I decided after a certain amount I wasn't gonna branch out that much further than my bread and butters of 80s thrash (a hard genre to be good at, I only get as deep as Testament...who I listen to when I overplay classic Metallica/Megadeth, they serve a good function as 2nd-rate imitators and that isn't a diss), 70s mainstream prog (but not the "weird" stuff like Can, Zappa is as "weird" as I get), 80s power metal, 70s hard rock/metal, 70s/80s arena rock/hair metal, the more arty arena bands like ELO/Styx/Queen, glam, 70s funk and R&B, the 60s titans (goes without saying WhoBeatlesStonesHendrixDoors), early-to-mid 90s alternative, and Prince/Billy Joel/Elton John/Todd Rundgren/Simon and Garfunkel for uncategorizable pop-rock titans I can't ignore because songs so great I guess. I respect the punk/new-wave/folk genres but I didn't get much farther than Clash/Ramones/Black Flag/Talking Heads/Blondie/The Cure till I realized it's just not for me, but that's okay. Dylan is my big folk exception, but then again he's pretty much everybody's who isn't into folk. Ditto with Muddy/Wolf for blues with me. Something outside of my main bread and butters has a high threshold to impress me at this point, I'm fat and happy and not exploring much new frontiers anymore...like when U.S. stopped at 50 states on North American mainland.
New paragraph...point is I can count the number of "hidden" 60s-80s classic rock/hard rock/metal/pop/90s alternative gems that are equal to stuff that at least got the Gold certification (US/UK...can be either) on one hand. Sure Budgie and Atomic Rooster are neat (going even deeper one-off side-projects like Armageddon or even more obscure bands like Lucifer's Friend), but they are still a distance away of being the equals of Sabbath/Uriah Heep (don't care if I get flamed for the Heep comment). Same goes for when people try to say Flamin' Groovies near equals of the Stones.
Big Star and Velvet Underground (who I respect and they have their accessible songs mixed in with their deliberate weirdness, but don't really care for anymore) and the Replacements/80s REM (though both started finally getting their just due by end of 80s at least among modern-rock radio playlists) are really the only artists I can think of who got unjustly commercially ignored.