Hi @AndrewAMD,
I have pursued this a little further with Ally (why let a good plugin go to waste?!).
Ally says the only fee close to this is a real-time data fee (currently $120-$130/mo) the exchange charges when this data is given to "professional" customers - those who use the data for business, are Securities Professionals, etc.
Could this be what happened to you?
Thanks.