Is Chrono24 certification worth it?

[J.P.Jones]

I'm looking at a $6k Rolex on Chrono24. The dealer has a solid 5.0 rating (over 300 reviews).
Chrono24 offers a $249 authentication service, which they advertise as the following:When you add Chrono24 Certified to your order, the seller sends the watch to our certification center after you've purchased it. There, the authenticity of your new watch is checked and certified by our watchmakers. The certification cost of $249 includes insured shipping.
Advantages
Digital Certificate of Authenticity including Authenticity Guarantee
Comprehensive authenticity check of the watch and box & papers (if available) as well as a check of the functionality of individual components
Insured shipping included in the price
Confirmation that your watch is not listed in a stolen watch database


Should I bother with this, if the dealer has proven himself trustworthy over and over again?