America's Got...Singers??

It seems like every season, the winner of "America's Got Talent" is a singer. I thought the whole point of the show was to find a talent worthy of a Vegas act. Don't get me wrong, all the winners are talented, but we see tons of singers on "American Idol." Acts like "Fighting Gravity," on the other hand, have no where else to shine but on "America's Got Talent." Yet, they always seem to lose out to singers or dancers who can also compete on "So You Think You Can Dance" or "America's Best Dance Crew." It's one thing if the singing and dancing acts don't meet the age requirements for the other competition shows, but acts that are eligible to compete elsewhere, should step aside and leave "America's Got Talent" for other talents.