Just my $0.02 -- I can't imagine a publisher or investor rejecting one of our titles based on the 3D Gamestudio name. I don't think it's significant to them. However, when I mention the name to colleagues and (especially) people outside the industry, they will often assume it's a hobbyist engine.
Which it is!
But by the same token, you could argue that both hobbyists and professionals use acrylics too, and that it's mostly a matter of what you do with it that counts. :) I do respond to any questioning glances with the fact that we've published three successful games using 3DGS.
Maybe we'll try our next title in GameMaker.