1:5 is definitely a ton of fun. If you buy used ask if it comes with a kill switch. These are usually run off the radio and in the event of radio signal loss, it kills the engine. Pretty much a must have since at full speed a baja can injure someone.
The price is definitely fair considering it started as a 1k gasser. Toss in the hop ups, I say you're priced fair if not under priced.
Personally I think people are just not buying right now.