HoneyB
Active Roster
Twitter screen grab failed 
Twitters blowing up about the money.
But it doesn't seem to be that uncommon. Here's a pic of a dinner that Odrick tweeted and a rookie picked up. 30K.
Having known someone who worked for the Bucs, i can vouch about the money thing.
Fast forwarding past all the training camp pranks and what not, what usually happens is: on the last day of training camp the team usually breaks down into position groups and goes out to dinner(unless Joey Galloway is on the roster, then you go to a strip club and he teaches the interns how to "make it rain"). They usually invite all the low level staff members/interns/what have you. They do run up the bill and they do throw money around, and then they do leave it to the rookie to pay for it. Its a common thing and usually a jab at them earning their first paycheck.
That said, if its happening more then once or twice, if its a consistent pattern, then this is total bull****. It is unique. It is abuse.
Honestly believe this is the type of story Schefter is using to try and destroy the Dolphins reputation. Rocking hazing and having younger guys pay for things goes on everywhere and every year. The Dolphins are no different, except they have the one player(Martin) who has thin skin.
I am more offended by what happened to the rookie than Martin.