I am a competitive person, and I am most competitive with myself. My homemade wooden bows are the pinnacle of difficulty for me. I need to build them well, and then I need to shoot them well.
I have nothing against fiberglass bows, I just feel like I would be taking a step backwards by focusing my attention on them, because I would be lowering the level of difficulty for myself.
I would definitely never hunt with one just because if I got an animal with it, there's a good chance that I could have got it with one of my bows, and that would irk me. Taking a big game animal with one of my bows is the ultimate goal for me, and to think that I may have missed a chance to do that because I chose to lower the difficulty for myself.... it would bother me. That might sound silly, but I just know that's how I'd feel.
I bet there is quite a few guys here who feel the same. To quote the great and wise Red Green: "Its not smart, or correct, but its one of the things that makes us who we are."