In my case I was only driving up to Boca on the I-95. The agent at MIA offered me the sunpass because "the turnpike no longer accepts cash" which correct me if I am wrong but it is $6.99 per day (not clear from your post) I actually don't know the way on the turnpike, hence I was going up the I-95, I told him this.
$6.99 per day. You're right.
Edit to add: In such an instance I don't really recognise what the relevance is of a station being franchised or corporate
Franchises often have unusual rules, with limited corporate oversight. So the Dollar franchise in Spokane can do certain things, like requiring pre-payment for fuel, being very attentive to minor scratches, etc. that corporate Dollar locations do not do, and thus most people are not expecting.