I think it all depends on how it feels with gloves on. Lot of people I know (some who played decent level of cricket) never weighed their bats or knew exact weight of their bats. Its all pickup/feel and ping.
For me, I am very particular about weight if I am buying it online because you cannot pick it up before buying. It has to be 2lb 8-9oz and that assures me that it will not pickup heavier than that. Cant take the risk of buying something heavy hoping it to pick up lighter etc.
But if I am in a store (and thats rare here), I put it on the scale only at the end just to to be sure....