No love for trimarans - why?

[GTom]

There are literally hundreds of mono-manufacturers, some islands are full of cat's (not the four legged ones...) - but I feel trimarans are very underrepresented in the boat world. Only a handful of manufacturers exist, competition is very limited. Why?

I see, that costs are high - but I assign that to the lack of competition and the small scale production.

I especially like the folding type, which offers huge deck space compared to a mono while you can fold the amas in the marina that you don't pay a cat's rate.

So far I concluded:
+deck space
+speed
+trailerability

-accommodation/storage
-self-righting