Or percentage-wise:
The dealer will get 30
BJ's out of 250 hands .000327858124% of the time.
It's definitely a small sample, but something isn't right here.
edit: 30 out of 180 hands brings it up to .0000002605207131%.
edit2: The above numbers are assuming a 4.83% chance of recieving a blackjack, and recieving exactly 30 during that run. I believe the numbers that aka used were "at least" 30. Going by "at least" definitely bloats the numbers; but I'm not sure which calculations would be a better representation.