Personally my view on a bat is that its an organic form so obviously varies from one to another, paying more doesn't guarantee the ball going further. A Grade one bat which goes well and costs £150 say may outperform a bat that's £280, who knows, you pay your money and you take your gamble!!!
Its not something that is manufactured identically over and over again (apart from the shape when machined) as the wood is different in each bat and there are so many outside factors that can effect it's performance such as pressing, over oiling etc as well.