Crwler, your custom actually looks quite amazing. Who cares about it being show worthy? That looks like something out of MTM2 for sure!
I don't doubt for one moment that any of these guys have a lack of originality. What you have just said is basically like saying there are too many monster trucks out there currently when it is basically what this version of RoR is all about. I don't think there is too many MJ tracks out there at all.
There are many talented creators here. They build what they like and make what they love. Some prefer the actual venues you see on a monster truck tour, or what you see on tv. Others (like myself) prefer building custom and fictional venues. It's a matter of taste and preference.
If you feel that there is a so called "lack of originality", or "too many mj styled tracks and not enough customs", then I'll tell you something that I've always maintained over the years: jump in the sandbox, and make your own content.