Honestly I really don't think so. Success is about marketing more than anything. Besides, just as some players can play wild solos and flashy lines but choose not to, some musicians can sell millions but choose not to - Frusciante each time he left the Peppers, and when focused on his solo work, for example.
I like Flea, don't get me wrong, but the only thing his popularity has to do with my appreciation for him is to think that he makes people want to pick up a bass instead of the somewhat-default choice of picking up a guitar.
Also, I really don't think that Flea would say something like "I sold millions so that means I'm good". I would really be disappointed if he did, actually. That's looking at music as a popularity contest, and as I said, I don't think it should be a contest at all.