> The problem with chargebacks is that they're mandatory, even in cases where the seller is more trustworthy than the buyer. Then you end up with all the losses associated with buyer fraud even if the overwhelming majority of legitimate buyers would have enough faith in the seller to waive the ability to conduct a chargeback in exchange for a discount in the amount of the fee that has to be charged to cover them.
This is actually accounted for in the merchant interchange rate. It varies by MCC (merchant category code) [and potentially merchant to merchant] and the frequency of chargebacks is built into how much the merchant pays for processing. Further, that bubbles up to the customer in terms of the pricing. Merchants may offer cash or other payment method discounts, so in a sense, what you're asking for already exists. Merchants do not opt into it because it's not in their interests.
That said, that's not how the math works out. If a buyer has a number of chargebacks, the buyer may be investigated and has their account suspended or is charged with fraud. This works both ways. Again, merchants and payment networks are aligned in this case, both make money on greater transaction volume, this feature increases transaction volume, that's why it's there, otherwise it wouldn't be there.
Also, paying per-transaction isn't really insurance as it leads to massive adverse selection risk. The most helpful chargeback for me personally was a two thousand dollar chargeback against Expedia where they refused to refund a refundable ticket. I filed a chargeback and I got the money back within a few days.
It's a good thing, unless you've got data to back your case.