Ribs are still a niche market. They might be big in Europe but on this side of the pond (I'm in Florida on vacation, on holiday... you know what I mean)
it's all hard boats, fully loaded, with big engines.
The Fletcher, arguably the better boat, purely because of the engines and internal layout and fit is going to be cheaper because it's going difficult to sell, and because it's a thirsty brute.
The Zodiac Open Pro 550 is an old boat now design wise, especially with captains chairs that were never practical. Newer versions come with a bolster seat. The advantage is it can be re-engined, and to buyers when they see a shiny frugal 4-stroke Yamaha - then it's an easy decision. It can also be retubed. Expensive I know, but with a set of new season Zodiac black and red tubes - it would transform it.
Back to gas prices here. Currently $3.30 a gallon, where as we're paying an outrageous £1.45 a litre. That's why everyone drives V6 and V8 saloons and trucks. If petrol prices halved back home, then everything else would change in time.
Not sure if that answers the original question... but that's my take on it.
Right back to the pool!