I dont think you are way off base. I actually had RCCar.tv was on my to buy list. Personally I see lots of oppertunity in the singular. The .com and .net are the main developed sites pertaining ot RC CARS. RCCar.net is actually the home of the largest and most popular RC Car Magazine in the world. The .Com is developed too. Just because people here dont play with Rc cars doesnt mean its not valuable. I think this is one of your better registrations IMO. Rccars.tv I would have passed on. I think the sigular version is going to make you money. Its only a matter of time until somone wants to make a video magazine site for Rc Cars with your .tv domain. best of luck.
