Antique furniture will not attract the higher FVF after May 1st (that is for collectibles and fashion categories, primarily), so the only thing that will be costing you more is whether or not the sale price on an item exceeds the old cap of $100. (FVF is 7% with a featured store, and I do realise that a jump from $100 to $250 for the cap is phenomenal, and not in a good way 😞 ). 

Insertion fees are 20c without upgrades, the upgrades are never free.