This could be exploitable. On the other hand, maybe it's nothing. Usually I follow up these things on my own. In this case however, going public could be a service to the trading community and the industry itself.
You follow two rigged bucket shop forex dealers who, for some reason (such as your current positions, etc), have a pattern of quoting different prices for the same currency pair. Bingo: arbitrage opportunity, i.e. buy low and sell high simultaneously (with either dealer, respectively) for a risk-free profit.
This would not be scalping, since only one transaction with each dealer (buying the low quote or selling the high quote) is necessary to lock in your gain.
You follow two rigged bucket shop forex dealers who, for some reason (such as your current positions, etc), have a pattern of quoting different prices for the same currency pair. Bingo: arbitrage opportunity, i.e. buy low and sell high simultaneously (with either dealer, respectively) for a risk-free profit.
This would not be scalping, since only one transaction with each dealer (buying the low quote or selling the high quote) is necessary to lock in your gain.