I think when the OP said 'I just stumbled upon an ad for a solid 18k gold daytona with eta 7750', he meant an advertisement (not Authorized Dealer).
But, as others have already said, this is not a very accurate rep. In general, it is best to avoid reps with 'gold' &/or 'jewels'. The 'gold' is flashed & often wears off revealing the underlying steel color, which makes the watch useless unless you WANT to advertise the fact that you are wearing a 'FAKE ROLEX'. The 'jewels' tend to be either glass or low end CZ, neither of which look very real, especially, on a FAKE ROLEX.
Unfortunately, modern Daytonas are a tough watch to replicate well. There are a number of options/variations, depending on what you are willing to give up to have your cake. Best to use the Search feature to read Ziggy's & By-Tor's excellent reviews on both the 'secs @ 6' 7750 & Daytona before hitting any BUY buttons. You might also want to search out my 'powdered graphite' remedy that addresses the inherent issues of the secs @ 6 7750 that powers many modern Daytona reps.