In all honesty initially I thought it was high. More a case of I have the capability, material and machines if the OP got no others offers. HOWEVER as I said in PM after a bit of thought and more understanding of what was wanted/needed the price is actually a good one in a business setting.That was a valid quote, with allowance made for client change of scope, and some f-around time finding out exactly what the client wants (which was proven exactly right by this thread). A rough drawing with valid dimensions produced, and go-ahead from client before manufacture.
£50 material, 2 hours to machine, and 0.5 hours admin, at £40/hour which is cheap since it's a "fun" job.
I tell ya what, I had a feeling some on here thought that £150 was a rip-off, but I don't bother working for free!
Having said that I also feel your understanding that some people on here (my self included) might like to do the job in a hobby capacity as opposed to financial gain.
It's one reason (amongst a lot of others) I am not in business.
The feeling of being creative when for 32 years you have only been in a caring/responsive environment is difficult to explain to others.