"if it's easier to raise price of item and do free postage?"
Well, that looks different to the buyer and some buyers find it appealing.
And you benefit if the buyer pays for Express Delivery I think - I think the buyer pays whole Express postage amount, leaving you the whole item amount without deducting the label cost.
But
The amount you raise will have the BPF added on.
Any hope of combined postage for multiple items bought in a single transaction will be gone.
(Probably other positives and negatives.)