Don't be so naive, skunk. At one time, they all probably did; Shure and Fender especially. Artist endorsements are another form of marketing buzz. Line6 is not alone with this. Your bias is, unfortunately, beginning to show.
Admittedly, I am still quite biased towards Line 6. But not as bad as some 5 years ago. I even looked at some oscilloscope signals posted on the net to see how the old Bean PODs performed against real miked up amps.
Since you mentioned Shure, how many people use an Audix i5 over an SM57 for snare drums and guitar speakers? I've heard from some experienced people that the i5 has a better tailored response than an SM57. Only that, the SM57
is the industry standard in those applications. If I were engineering for some producer, I would bet they would point me at the 57 first because had I offered him an i5, there would be more explaining needed (hence more studio time wasted).
I hope my point gets across, but when something new AND GREAT comes out, the first problem is toppling a trend. Line 6 was able to do that because I've seen, read, and *laughed at* their very old ads way back some 6 years ago. My ears didn't tell me the soundclips sound right. As an example, a friend of mine and a beloved luthier, gets a lot of ridiculous comments regarding Line 6. Some client of his says, "Ang ganda ng AC30 pala!....Nasubukan ko kasi sa POD." Whereas Arie, says, "I've tried a Vox AC30 reissue with Blue Alnico Speakers myself yet I cannot even claim it sounds like an original Vox." Do you think Line 6 marketing did not have something to do with that? Of course it did. I saw how "brave" they were at making a lot of ridiculous tag lines to sell their products. It almost made noobs think that owning a modeller is like owning a multitude of amps, for much less.
Anyway, what I've learned, at least, is that if people are happy with their tone, no matter how "sucky" it is for the engineer, tapos na ang usapan.