the hypalon fabric
of a 1990 Avon is not depreciated. If anything it is made better than some of the later years, and will far outlast a brand new PVC boat. These old boats hold their value to people that know what they are worth. People that repair boats will tell you.
I Just seen a 1974 zodiac
14ft here for for $1500. There was a line up to look at it, came with a same year Johnson not running well so most value was in the boat.
I actually use a 1988 achilles boat and have purchased a 1990 Avon boat like this, the heavy duty fabric is like new, and the wooden marine wood
floor is probably better quality material than you can even by now.
these boats don't "age" from the years like people with little experience think. they age from the UV rays or use. There is some models where the glue fails over time, but there is the same in fibreglass or whatever.
This fabric is not "ready to fail at any moment" just isn't. This boat may still go for 20-30 years for all we know. Some of the original hypalon boats are still going. You probably shouldn't act so sure about something you don't know about as you are wrong.
Talk to some repair people, or experts in inflatable
Look at some Avon Seasiders forums
to see how old and beat up some of these are when someone puts a little elbow work
into restore. and look at the prices.
PVC on the other hand.. well UV takes that out eventually, just like a pVC pipe.
But hypalon with the neoprene and nylon interior
, well my friend go inside of a army surplus and check out how long good material can last..