limping in AK is a terrible play imo. It would be ok ish in later stages when you want to bait someone but still I consider it very weak.
By limping in you are giving other players a chance to cheaply see the flop. So many players with connector or suited cards would tag with you for the ride. So when they connect with the flop, your hand becomes worthless.
But if you did raise 2.5-4BBs they aren't likely to call because their chances preflop are not that good.
I'll give an example that happened to me. In the middle stage of a tournament about 20 players left. (40 player sit n go) I was like the least stack in the tournament. I was in the BB with 10,3 offsuit. Hi jack calls. others fold. I check. the flop comes 10,3,9. Me hitting a pair. He min raises. I call. Turn comes something like a 6. He goes all in. I don't have any other play than calling so I call. He show pocket aces. I win the pot with two pairs.
If he did raise preflop I would've probably folded without a second thought. He tried to slowroll me and paid the price.
Eventually I won the tournament.