Those that have a legitimate gripe with fvf on postage are those that post overseas.  They need to charge postage that will cover them for eBay and PayPal protection and then they get slugged 9.9% on top of that.  They add the fee amount to their postage charge and their buyers give them low DSRs for postage because it costs so much and they cop a defect.

eBay, put a nominal cap on the fvf on postage for international postage e.g. max fee payable on international postage is $2 which means if you pay anything over about $20 your do not get charged additional fees on the postage.