The handle on the bet was sufficient that it doesn\'t explain the low payoff.
As somebody who cashed this pick-4, I understand your point about it usually paying more than parlay, but there were some logical reasons IMO as to why it didn\'t and I wasn\'t too surprised when I saw the will-pays.
1. The most solid favorite in the sequence was the other half of the entry that won the 2nd leg. I know that Warrior\'s Reward got bet down late, but it would seem that more people would view that race as wide open than Prioress. The entry should have been 4-5 or 3-5 in the Prioress except for a ridiculous amount of money bet on Gabby\'s Golden Girl in the win pool, which may not have been the case in the multi-race bets.
2. Dry Martini was 6-1 ML, so the $23.60 in the win pool was a bit of a surprise.
3. The horse in the last last leg was 4-1 second choice on the ML but paid much more than that in the win pool.
I think it added up to what looked like an underlay. I was alive to 5 horses in the last leg and except for the two long shots I used, the rest of the will pays were all similarly underlaid.
Nothing suspicious or sinister.