Definitely a conflict of interest.

Cash handling costs is a real issue though. Not counting under-reporting income, credit cards cost the most at US intercharge levels of 1-3%. Then the all-in cost of cash handling. The lowest cost method is debit.

The lowest cost is in the EU in this regard. Anti-rent-seeking regulations ain't so bad for everyone, save the rent-seekers.

BTW, I used to handle around $7M/year in credit card transaction in the USA, and if you got actual hand-written partial numbers on a signed contract, then we could avoid nearly 100% of charge backs, as we always delivered on our end. I think in 14 years, we had around 10 charge back attempts, and our merchant provider loved us. The only time I ever magically lost a charge back was to a Visa executive for ~$10k, and our merchant provider just shrugged. Whatayagonnado?