Thanks to the new Royal Mail pricing system (which I think is brilliant), it is now cheaper to send 2 parcels each weighing 900 gms than it is to send one weighing 1,800 gms.
I am now selling “fluid” items (Lego, Meccano, Stickle Bricks, Knex) in batches weighing 900 grams. Sure, I do incur an extra 20p listing fee for the second item, but in return the total postage is £4.24 (second class packet) instead of £5.31 (standard parcels), so that’s less Paypal fees to start with. The buyer gets the item the next day (second class packets arrive at the same time as first class), the lower postage costs will attract more bidders and final combined prices are higher as smaller quantities appeal to more bidders and won’t hurt the pocket as much. Thanks Royal Mail.