I went through the same thing. I had gotten to the point where I was towing my 911 to track events. When you started looking at hotel room, gas for the car and the tow vehicle, food, consumables, etc., a DE weekend was north of a kilobuck. Multiply that by 2-3 events per year and the ROI wasn't that great.
So...I got into ChumpCar (now ChampCar) racing with some buddies at work. I spend less money than I did on track events and get to do wheel-to-wheel racing 2 or 3 times a year. Plus, ChampCar is endurance racing so you get 3-4 hours of seat time per weekend.
Our current weapon: