Seems like the right strategy. A chargeback request automatically implies a $25 fee for the merchant if I remember correctly (read this on Braintree long ago). I'd expect any merchant will want to avoid disputes/chargeback requests like the plague.

Take this with a grain of salt, it seems excessive, I should probably have looked it up again :) But there definitely is some kind of strong incentive for merchants to avoid these, not just because it wastes time for them.