$1400 sounds pretty high. But AC work seems to be very high compared to other service. That's the main reason I bought all the equipment to service AC myself about 10 years ago. The cost of the gauges, vac pump, and other miscellaneous tools is way less than many places bill you to re-charge a system.
It hasn't been all roses though. I've had my share of learning mistakes where I've replaced parts that didn't need it. This latest work on my K2 is an example. I chased the leak based on internet chatter about the lines. I bought all new lines, then noted that the compressor had been superseded due to problems I was seeing on the net too. So, I thought it may be the compressor. I even vacuum checked the condenser and evaporator with an isolation plate I made. They both vacuum checked fine. That's why I thought it was something other than the condenser and evaporator. Only after I had changed the lines and compressor and it didn't hold a charge for more than a few days did I re-check the evaporator and condenser with my adapter, using high pressure instead of vacuum. That revealed the condenser leak.
So, I've spent more on parts than I needed to. Probably $500 more this time around. Still with the $500 for the new compressor and lines, plus the $240 I paid for the condenser, I'm sitting pretty well inside the going rates for a condenser replacement, plus I have an almost completely new, latest configuration, system, except for the evaporator. Of course, I spent a bunch of time working on it. No free lunches...I guess.