According to a report from The Wrestling Observer Newsletter, wrestling legend Hulk Hogan actually had some discussions with members of The Bullet Club several months ago about possibly joining the group, but a deal could not be reached.
Hogan has publicly stated that he is a fan of the group and has even joked about maybe joining them at some point. According to reports, the biggest reason why it didn't happen was because of money. Hogan's asking price was apparently too high. Also, there was some concern that he might not be able to make any sort of a long-term commitment, especially if WWE ever calls him about coming back.