Your work dictates the level and type of LCR meter you need. Caps in RF filters ask for different gear as high power inductors. Companies that build calibration gear, or LCR meters
have other demands as a company that makes simple cheap power supplies.
You want the value at the frequency the component operates. But there is DC bias, shielding your DUT, guarding, more wire measurements, precision, repeat-ability, stability (f.i like over time and temperature) Output frequency, voltage and current.
Then speed, ease of use (you can measure aF with a GR-1620 set but that can give you 30 minutes of fun and frustration, that is, if you know how to use it correct. )
I was building a high resistance standard for a customer to be sure the leakage through the cabinet was as small as possible I used my old
HP-4329A (
http://www.pa4tim.nl/?p=2269 ) While doing that I could not get stable readings, after cleaning it over and over and a lot frustration I found the problem. I was standing about a meter or so from my dut. The movement of my belly while breading caused the fluctuations.
Yesterday I had to match/measure some Peltiers for a drywell design. You need to measure the resistance with AC but they produce a current so you need an LCR meter that does not care about DC. Not about LCR meters, I once repaired an old analog simple function generator. The reason for repair instead of replacing it with a modern one was the conditions it was used in. A modern digital would not survive that.
So there are a lot of factors and if you need something almost nobody needs it becomes expensive, that is, if enough people need it and a manufacture makes what you need. The price drops if something can be mass produced with "normal" parts.
And there are many more special cases.