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[ShaneAtSea]

The right question is why not, when bare GRP decks are functionally superior to anything else.
But you already answered this question when you said that you like how wooden decks look.
Which is OK, as long as you're aware that it's a form over function choice, which you'll regret on the first day of sunshine, when walking on a synthetic deck (or also natural teak, for that matter!) barefoot.
And as I said, there are also other drawbacks - it will just take you a bit longer to find out.

The boats im looking at would look unfinished without decking. GRP may look ok on a 20 footer but not on a Manhattan 55

It just looks horrible

 

[rafiki_]

I really like the look and feel of teak decking. I know it takes a bit of maintaining, but worth it for me.

 

[MapisM]

The boats im looking at would look unfinished without decking.
GRP may look ok on a 20 footer but not on a Manhattan 55
It just looks horrible

So, it's not even a matter of personal aesthetic preference, which as I already said would be OK - each to their own on that.
What you actually fear is that someone might consider your exclusive boat horrible, with the same deck as a hoi polloi 20 footer.
'Salright though - that's your problem, not mine.
I just regret having wasted some time with this debate.