150 should be max.
I'm not sure how you could say £150 should be the max price, considering raw material costs have gone up a fair bit and manufacturers overheads are an unknown quantity. That seems very low, top of the range bats from 10-15 years ago were still around the £200-250 mark. I would much rather put my money into a UK manufacturer, but no doubt the overheads are going to be higher so I accept the costs are going to be higher than bats made in Asia.
The thing with willow that I find strange is that it's graded on looks as that's pretty much the only thing you can grade on when dealing with raw materials. Yet we know that the vast majority of times looks has nothing to do whatsoever with how well a bat plays.
For me, GM bats are unbelievable value, made in the UK and their own grading system seems pretty good, but I'd never shell out for anything in the 909 and above range as for me personally the law of diminishing returns kicks in once I go above the 808 range. Yes the bats are prettier, but am I getting a bat that's twice as good for what is effectively twice the price of a lower grade model?
Nope, not in my experience.
There is a quality/value peak for me that sits around the £150-200 mark and I don't think this has changed for quite a few years. It does fluctuate between manufacturers (Gray Nichols grading for me is terrible compared to others around the same price bracket) but chances are, it's not going to be a plank, it's not going to be the prettiest either but will almost certainly be a quality performer that given a bit of time will help me score runs.