Wooden said some players he had spoken with had not registered because they feared that their reputations would be hurt and that business clients might leave them if those clients thought the former players were sick. Other players, Wooden said, are superstitious and believe that if they register, they are bound to develop an illness.
The full article is here. Many will say the injuries are part of the game, but long term brain damage is not like a bad knee or back. These players deserve what they can get from the NFL. Some find it hard to sympathize with millionaire players, but the owners make billions and have a responsibility to provide healthcare and adequate compensation.