[Cooker]

This is not true. All preflop situations are plus EV with aces, but the maximum plus EV result is every player in for a cap (so with 10 people at the table you earn the most money on average when every player stays in for a cap). This is because the pot grows much faster than your winrate goes down with Aces. A quote from page 126 of Getting Started in Hold'em by Ed Miller regarding playing AA, "Getting it all-in against all 9 players is actually your best result, but you will never be that lucky."

For this reason, if I had AA in middle position with 3 callers ahead and if the button was a maniac that raised every pot, I would limp reraise hoping to trap even more players in. With aces, the more the merrier as long as you aren't sacrificing raises. Still, you are better off with 2 opponents for a raise than with 5 opponents for a limp.