How wide are spreads on Betfair NJX?

How wide are spreads on Betfair's New Jersey Exchange (NJX)?  Despite the surprisingly strong volume, spreads appear to be REALLY wide so far.

Here's the last screenshot I took from yesterday's 2nd race at Presque Isle Downs...

And just in case you think that race was an exception, here's yesterday's 5th race at Louisiana Downs...

Those two screenshots are both in the final minute before post time, when liquidity is at (by far) it's best.  Spreads were much wider a few minutes earlier in each case.

These wide spreads suggest two things:

1. If you're matching other people's bets, you're very likely getting screwed by the spread.  You're generally going to be much better off placing an offer and letting someone else match it.
2. Either the people who are 'Betting For' or those 'Betting Against' (or both) are getting a particularly bad deal if they match existing bets.  Sometime in my next few posts, I'll make an attempt to calculate this.