Is winning MITB a curse to most?

Before I go into this threads main point, here are all the people who have held the briefcase in the past...



CM Punk - twice

Del Rio

John Cena

Damien Sandow

Rob Van Dam

Daniel Bryan

Mr Kennedy

Edge

Jack Swagger

Dolph Ziggler

The Miz

Randy Orton

Kane



Now when you look at this list of previous winners, ask yourself this...

How many of these went on to be/already were main event talent for a LENGTHY period of time?

Punk, Edge, Orton, Kane, cena and possibly van dam (at a push)



Out of the 13 punk and edge had their careers elevated by winning the briefcase.

cena, Kane and Orton were already top talents when they won theirs.

Bryan is a top talent now but not for a consistently lengthy period.



Look at the others....won the briefcase, cashed in and suddenly all mid carders/jobbers/left the company.



This leads to my question, does holding the MITB briefcase serve as a curse to most superstars?

It seems as if talent is getting a big push after winning MITB and after cashing in, they eventually lose their title and get dropped to the mid card.