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It's more the price difference for the good ones. The cost of chroming all that material to a high level means you can easily spend the best part of a grand for the cheaper brand ones. There's just not much on offer in the middle ground.
You're right though, it pays developers to spend money on taps and fittings which are likely to affect your perception of the quality of the build, the rest of it is often whatever they can get away with.
Disappointing what people will do to cut corners when they're working to a price on jobs.
This what I did wonder, all the work in our flat is a very high standard and all the taps, boiler and appliances etc are good brands, but I figured with a towel rail they would just get something dirt cheap as it is no more obvious what one is to the next.