I can tell you right now after trying to get a single game added because of my high score, I do not trust TG at all. I have been trying since April 2009 to get them to even add a game for me, and then put my record in.
The game is Steep Slope Sliders. You can do a youtube search for world record runs and find my run. In a game with no dipswitches, no difficulty settings (unless you count playing it in Japanese where the scores per level are lower), they still refused to add the game since I could not track down a dedicated cabinet for it.
Yeah, I would love for anybody on klov to track down even a picture of a dedicated cab, since I have never seen one.
After trying for multiple years, I sent the new arcade judge an e-mail through their website awhile back, and have not heard back, so I have pretty much given up entirely on anything being valid within TG. Apparently there was also some debacle with an older judge and adding scores and stuff (I do not have the details right now, but I am sure Google can dig up that dirt).
Walter Day seems like a cool dude, but the people under him for arcade games are not much help at all. Yes, this is a partial rant, but I have been dealing with TG since April of 2009 and have gotten nothing but the cold shoulder from those guys, so it only makes sense that even the mention of TG puts a really sour taste in my mouth.
Back to the games, with Steep Slope Sliders, you can watch that video and see what I have hit. The bad thing is that I was playing it later and not recording, and beat that score. If you want to know the average score that is pretty much expected, watch that video and before each level, it will say the points it expects you to get. The game seems to expect me to get somewhere around the 10,000 range or less to make it through the game, but I am up in the high 40k to low 50k range. I bet if I started playing that a crap load, I could hit 60k. I would need a near perfect run where I hit every single trick spot perfect, but I know it is possible