>But isn't it true that someone investing in your game would play it first
>and then base it on it's merits?

Not necessarily. Not if you tell them it's made with 3D Gamestudio. And not if it's a prototype in development and you are seeking completion funds. Especially not if you have a whole design and are pitching it to a publisher. They hear "I'm making it with game studio" and they think "big rigs" and "big game hunting"

It's just the way it is.