You may find that there are alot of people thinking the way you are about that boat and find yourself in a bit of a bidding war. The value is already in the boat, the Maxum 2400 SC3 is an awesome boat. I know of one that was bought in 08 and they never let it rest. They have had no problems with it and it has about 130Hrs on it.
Brunswick has stated that they will honor all warranties, so if you get the extended warranty you should be good for at least 5yrs. The mercuiser side is not closing so you can always get motor and drive parts. As far as the boat itself goes there are lots of discontinued boats out there that have to shop around for parts and other than the custom Maxum stuff most of the accesseries and hardware are common to other brands and easy to get.
We have an 08 and were wondering about resale, we figure that up to 5yrs. you will take a bit of a loss anyways, after that it comes down to how well you keep your boat that will determine what price you will get.
It took us four boats to decide what one was right for us and buy new this means it is a keeper and don't plan to sell her for awhile, by then it will be just another old boat competing with all the other old boats.
If you are serious start as low as you want and see what they say. Don't forget to ask about all the extras,trailer ,covers ,electronics,extended warranties, etc.....