Yes. They won't like it. I know for sure though that it would increase sales significantly. Frictionless billing is what made Apple App Store so successful.

"The average rate of cart abandonment in 2015 is 68%." - this can be halved if billing is done through one-click order billed to preset card. It's even more pronounced in Boonex Market, because every vendor has their own separate checkout, so shopping cart has be checked-out in stages. Theoretically, we should be able to DOUBLE see more checkout success. Refunds on subscriptions are only given in cases of approved stolen-card cases, which is handled by PayPal and Stripe quite efficiently. So, at the end of the day, even if vendors only try this with a few products, they may end up seeing the benefits and then expand.