It's not even a particularly tall barrier for cracking manually.
The face of the lock implies 64000 combinations. Knowledge of the internals reduces that by 99.875%. That's almost 3 whole orders of magnitude, and reduces the absolute worst case scenario for opening the lock to about 45 minutes. The attack need not take place all at the same time, either, and once completed, the lock can be opened in the same amount of time an authorized opener takes.
Don't use this type of lock to protect anything valuable, kids. It deters snoops and casual thieves only. Use it to secure your bike, and both may be gone when you return.
Even 80 attempts isn't a tall barrier when you're cracking in an automated fashion.