Did Naples share this with you as part of the deposit paperwork?
I understand why dealers do this, my issue with the Porsche dealer was that they did not disclose this at the time of the original negotiation and placement of a non-refundable deposit. The Porsche dealer (and also my Lotus dealer) asked for Additional Dealer Markup, but when I got up to walk out, both agreed to MSRP. If I had agreed to ADM, and then they inform me about this for many months, I'm not sure I would agreed to sign.
For dealers selling hard to get cars at MSRP, makes sense - just be upfront about it. If the dealer is charging ADM then I'm not sure they should be entitled to the optionality that comes with that provision.