The Reds meet Palace tomorrow night.
"It's not a surprise - not with [Daniel] Sturridge and [Luis] Suarez and the quality they have there," Pulis said.
"There's been a lot investment in Liverpool, I think people forget that.
"Kenny Dalglish spent good money bringing in the likes of Suarez and Jordan Henderson who have obviously really blossomed.
"And then Brendan has come in and spent decent money as well.
"The biggest bonus for Liverpool is not having any cup competitions or Europe to worry about so they can focus on the league week to week, that helps as well."