That reason is marketing. Talent and good looks are secondary, you can be the most talented and good looking singer out there but if the record labels et al aren't backing you then the odds are very much against you. Britney doesn't have the talent or lasting appeal, she's doesn't even seem to have that much common sense. I don't even think she's a major sex symbol (on the level of Madonna for instance), she was a sexual commodity for a while but even that seems to have now passed.
Also, you seem to be under the mistaken and naive assumption that popularity indicates talent/that a game is good/what a sex symbol is.
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