Flat pricing or what I call, menu pricing, works for a lot of services: Wheel align, tire rotation, wheel balance, fluid services, LOF, etc. While just about any service or repair can be menu priced, trying to bridge that concept to many repair jobs can have a negative impact on your bottom line. A lot of repair work is vehicle specific. The job of assigning menus can be a daunting task, but not impossible.
Be competitive on the services that consumers regularly compare to with other shops, but you need to be very profitable on repair work. If not, you will not make it.
We often base of price structure on what the "other guys" are doing. We compare ourselves to the average shop. Remember, build an outstanding business and you can charge accordingly, but be careful, if your shop is not perceived as top notch, you will never be able to charge what you are worth.
Personally, I don't want to be the average shop, anyone can be average. I strive to be the best and hire the best. It's like a ball team. Does a ball team work to be average and hire average ball players? No, they work to be the best and know that they can be the best with the right players, training and equipment. We are the same.
Look at your margins, understand the numbers of your business and your breakeven. And never, never, never, base your bottom line or sales goals on breakeven. Just paying the bills is not the reason you went into business. Making a profit is.