If you'd read the entire thread, which I doubt, I already gave a real world personal answer.
That said if you want something straight out, I'd say that if you are a cheapskate, anything above £100 is going to sound very expensive to your ears, if you are so rich that money is never an issue, I'd say anything above £1.000.000 could be considered expensive.
If you're an average John Doe, the limit would be around £2500, so basically above average monthly wages, which is £2633,5.
But, as I already wrote, so it will avoid you to read the whole thread, anything expensive is something beyond your budget, so everyone will have a different answer.
And, frankly, the argument of the gigging instrument is a bit dull as it's absolutely not the main point to consider.
That said any mass produced instrument is, to me (but it's the point here), way too expensive, especially Fender-like instruments, which are basically two planks screwed together.
Satisfied?