Wow, this is cool. i already got to lvl55 four times, but this actually helped.
My Profile Canceriddenseal got "Corrupt," and I mispelled my email adress and forgot my password so there is no way of fixing it. Made a second account and combining the two gamerscores together.
Canceriddenseal Gamerscore: 17318 +
-50 = Total GS.
Would love to boost online challenges and such. to rank up fast. for Black ops