I think there's a $$ limit on when free delivery is cost effective for the seller, really. I've recently sold items for more than $10,000 and if I offer free delivery for say $500, it's a good incentive for the buyer.
But it is out of sync when you consider that an item for say $300 will cost $500 for delivery.
Here's an example of how riiculous ML is regarding P&P. An item I would have bought until I saw the 'extras'.
Semillas Orgánicas De Tabaco Rubio Virginia 1 Capullo - $ 150
EL PRECIO PUBLICADO SE ENTREGAN 1 CAPULLO.SEMILLAS FRESCAS DE TABACO VIRGINIA (RUBIO) CASERO (Org.) COSECHA 2021!IDEA PARA LA HUERTA CASERA (ORG.…
articulo.mercadolibre.com.ar