First, Welcome to TUG
Next, I never heard of A1 marketing but anyone that needs their money up-front, is 99% sure a scammer. They make their money from the up front fees and will do little or nothing to sell your TS.
If you were to tell them that they can have $3000 out of the proceeds from the sale and they will turn you down flat.
For the TUG advice on how to sell be sure to read the thread
"how to sell your TS"
Good Luck