I think this thing looks gorgeous and is a cool ship to my taste, I would love to own it, but $600 is just such a huge amount of money to spend on an upgrade to an already pretty cool set that cost 1/5 the price. Hard to imagine I ever get it without finding a really good deal on it. $400-$450 is probably my tops.
Giving us fun themes (Hidden Side) and great technology (Bluetooth remote). 😅
On a more serious note, why does Lego want to go digital? They are one of the best analog toys. Parents don't want their kids on phonrs and adults are looking to get off them. Don't build stuff that requires phones.
Easiest way to price check is search ebay. Just plug in the set number & Lego. See whats currently for sale & sold listings. You can search Bricklink and brickset too https://brickset.com/sets/1752-1/Boat-with-Armour
If you want to sell locally try Craigslist, Offer Up, & FB Marketplace. You'll need to list at least 20% less than ebay prices and be patient. Ebay is quicker but is a hassle if you're not set up there already.
You can list them here too. You may get an offer just from this post. But it will be low 😂