[ja3k]

This is a reason things will get slightly out of line but not to this degree. You can (and I did) buy all the NOs in the Predictit electoral college market and get a guaranteed immediate return.

If you can buy n NOs for less than (n-1-0.1) on predictit you'll make money net of fees.

The bigger issue is trader limits. I could only take $50 worth of arbitrage because I can only own $850 worth of shares in each bracket. They also limit markets to 5k traders (which most markets have hit at this point) so other arbitragers can't come in and correct the prices.