Quoted from Butch2099:

I'll take a shot at this... short answer is most people don't want the hassle of bringing a game to the show which means breaking it down in their home, loading it up, bringing it to the show, setting it up at the show, having people beat on it for 2 days and needing a shop job when you get home (if it survives) to save a $20 admission fee.
Yes you have the incentive of someone possibly buying it at the show but there's no guarantee.
Plus, the higher the value of the game not only did you lose the casual person who may have $2,000 in their pocket now you're counting on someone to have $4,000 +. Possible but not likely. Also throw in if you have a low play perfect game, now you may have tripled the plays on it when it's done.
A lot of the newer/higher priced games are typically brought by the people running the show or vendors. I say typically because there are a few who do bring games out of their collection.
Ok, short answer wasn't so short. Flame suit on
I will add that I have brought games to each of the last few shows. I've brough 2-3 games to each, Allentown, York, the Ohio show and Pintastic to help support the show. You just won't see me bringing The Hobbit

Quoted from eabundy:

I don't know, I think bringing NICE pins to share is a great thing for the show to share, and watch other people that couldn't normally afford a multi thousand dollar toy a chance to see touch and play it, otherwise it's like leaving plastic on your furniture .

Quoted from eabundy:

Probably not, your may get marks in your shooter lane.

Quoted from docquest:

Yes!
You never know who might show up to play it.

Quoted from jrpinball:

Aside from the Garden State Parkway and the NJ Turnpike, there are no other toll roads in NJ. Well, maybe the Atlantic City Expressway too. Yes, the bridges and tunnels into NY and PA have tolls as well. I guess Carlin had a point.
The worst though is the PA Turnpike. High toll rates on that highway. Delaware gets $4.00 for their big10 mile stretch of interstate highway.