I was arbitraging MtGox vs US/Canadian exchanges up until 6 months before they blew up. The spread was easily 3% even then. Thankfully they took 28 days to wire

I was arbitraging MtGox vs US/Canadian exchanges up until 6 months before they blew up. The spread was easily 3% even then. Thankfully they took 28 days to wire me $10k and I saw the writing on the wall and stopped in time.