[QUOTE=goose148900;6866]big difference between this [sportsbook] and table game overpay.[/QUOTE]
Yes, in gambling you are paying vig for a service. In the sports book you are paying for them to set a line. If the line is wrong or stale then you can take advantage - a bet is a bet. But you might not accept a mispayment for the same reason you might not accept a mispayment at the gift shop or cashier.
But at table games the service [I]is[/I] the payment. You play a disadvantageous game in order to get paid properly. It's not your job to add the cards at blackjack; it's the dealer's. So if they overpay then they haven't done their job.
By analogy, consider those rip-off currency exchanges at the airport. I would feel less guilty about accepting their mispayment than a casino cage or supermarket mispayment.