A few years back I tracked what my disposable costs were per run and it equated to about $3500 (back when I was happy being a 3.90 top fuel car). I am talking about things like oil, fuel, spark plugs, disks, floaters, rod, pistons, cranks, cams,(cycled out over a certain amount of life), springs, valves, blower stripping, bearings, rings, tires. I am not including the cost to buy the major things like blocks, blowers, heads, etc or repairing them or the inflated cost of nitro this year. I am not including crew chief and crew help or the cost of travel and hotel.
I am not going to dare to track it this year and I know the results on paper didn't show it but we focused on trying to make it run quicker than a 90 car. I know the costs are greater as I threw out a lot more rods and pistons lol.
The answer to the original question to me in the top fuel class is no. Unless you are okay with making one qualifying run in the 90's and seeing if that gets you in show and most likely that 90 run won't get you an event win or very deep into rounds. First round loser walks away with 10k and event winner walks away with 50k it is going to be pretty hard to make a living or build a competitive car without a great marketing partner or two.