Dude, you have an expensive hobby. But dang it's cool!! I totally believe you about the leafs and the overall wear and tear those rigs get in just one quick run, I was shocked when I learned leafs were used but it makes complete sense when you think about it.
Typically it's $175 plus $50 in shipping to have the packs serviced from deaver so it's not too insanely outragous. The packs we just bought were $762 shipped to vegas in comparison but from here out should be just the service fee to keep them in brand new condition every time we hit the starting line.
It's another $100 to service shocks between races, another $50-80 in fluids every race, $20-70 in bushings every race and then the rest really is just labor and that's assuming nothing is broke and needs replaced/fixed. Most people figure roughly $1500 bare minimum to get from one start line to the next if you have no major repairs after you figure gas, entry fees, prep, testing, etc... This is entry level racing though, it can go WAY up from there, like 6 figure up from race to race depending how serious you are.
BTW, we chose a fastest class out there that requires leaf springs so that's why we run them. There's other leaf sprung classes that exist but the rules limit the trucks more and they're slower and rougher. There's classes that don't require them either obviously but honestly, if you want to actually be competitive in any class that allows linked rear suspension, even at the entry level, you need to be putting down 300-400 minimum at the rear tires and that prep cost is probably more in the $3000-4000 bare minimum to get from one starting line to the next. As soon as you link your truck, you just set yourself to line up against the big boys. The next jump up from where we are in class is a big step up in cash flow if you want a remote chance of winning. If you want to just go out and finish and not be in the top 10 even, you can run on our budget. We wanted to race though where we know when we're on the starting line we've got a legit chance at actually winning if we have a good day. Really, imo... There's only 2 other trucks out there right now in our class that can compete with us and I know of 2 more close to done that should be a good threat. The rest are just road blocks for us assuming we don't have issues. There's a truck currently being built that if we both have a perfect day and drivers were equal, we wouldn't be able to beat him. Luckily the desert usually doesn't allow for that perfect scenario.