I think we all want the answer to this to be yes. I show Poppy, my High Adult Amateur Jumper at A and AA shows. Sometimes there are ways to attend these shows less expensively.
My recent show was pretty average as far as cost. It was the Regional Maclay Finals so they were not going to make anything "cheap." I also find if it is a FEI show then expect to pay premium prices (this show was not FEI). To start with the stall was $200. I had 6 bags of shavings at $8.95 a bag ($53.70). Office fee is $40, USEF fee is $16, zone fee is $2. So before even entering a class fees are $312. Training jumper class fee $50 and NAL class fee $120. So now the total is $482 for essentially 2 classes. Since I do the jumpers I don't pay braiding fees. I also save my horse and I do not enter a bunch of classes. This saves significantly on fees plus contributes to the longevity and health of my horse. I think if you don't get to show much you get wrapped up in the "I'm going to do whatever classes I can and get mileage while I'm here" and quickly rack up a $1000+ show bill. I trailered my own horse and used just over a tank of diesel which was around $100. I do my own horse care so the only additional fees are training. Getting 4th place in the NAL meant I won money which brought my show bill down, woohoo! I was an hour from home and commuted from home which saved a hotel fee. I did have barn help Friday night at home so that was an additional cost. I always pack my own drinks and snacks. I maybe spent $10 at the concession stand. I also did not allow myself to shop the tack stores, thus saving alot.
OTHER WAYS TO SAVE $
I could have saved on shavings by bringing my own (they are $3 cheaper at my feed store). If you are looking to save on trainer fees talk to them about being a working student at the show. Many need help and would welcome the extra hand at the show grooming, cleaning stalls, etc.