Salesmen are one hell of a MYTH SPREADING source , and most guitar store salesmen I've met in my life donno real crap about music,guitars, or anything related ... Now that I'm somehow experienced with guitars and so , I usualy spend so much time laughing at what the salesman was saying after a visit to a store with a friend or something.
And if I try to correct them , they're very hard to persuade ! ;)
Anyway , when you buy something based on a poor advice by a salemsman or a friend , it's your problem not theirs ... Don't spend so much money on something you're not quite familiar with.