Having just spoken to 2 servers/bartenders, here is the response I received regarding tips....
Although Gift Cards are nice and thoughtful, they do not pay the bills, If a guest does not want to carry cash or tip on card, perhaps a
Visa gift card might help them out. At least we (servers) can use those at grocery stores or gas stations.
"At cash out daily, we balance cash, credit cards, kttw, disney dollars, etc as individual amounts, it is almost if not always impossible for us to exchange dd's for cash." Although we would never question a guest leaving such, it also does not pay the bills.
Side note: I also know that CM's are taxed on 18% gratuity per table regardless of amounts rec'd...... so for me its cash and usually 20+% based on service
just me