You could and there is probably a level where you will begin to see a difference however I would argue that the process of having a bespoke cue weighted, balanced and tailored to your specifications and action would help anyone capable of stringing a few pots together and that’s probably the most valuable thing you’re paying for.True, but someone could play just as well with a cheaper cue and do not need to go down the Parris type route unless they are a serious player.
By the same logic though, given a good range of £50-£100 cues of varying weights, lengths and ferrule sizes to trial you’d probably find a queue that is as appropriate for you as any tailored £600 cue.