Gronk's Money Machine

If Rob Gronkowski retires from the NFL, you can't blame him if he makes that choice. His injuries would be reason enough.

He is underpaid by NFL standards and has many options if he quits. He has a standing offer to join WWE. Action movies are also on the table.

He has carefully crafted his brand. His father and brothers are all involved in his money machine. He is known for not having spent one dollar of the money he made in the NFL.

Whatever he decides, it will just keep the cash flowing.