Yes. I understand the purpose of a PSO. However, BMI are essentially a business airline (the route was mostly used for leisure travel when 15000/month frequented it - I’m sure you know all about the history of the route). They are an expensive business airline. Thankfully when using them before (primarily BRS to ABZ) it’s been business trips and not coming from my pocket.
As for a “remote island airport” I can be in London more quickly than someone who lives in some parts of England. Although, it’s difficult to decipher your sentence, so you might actually agree with that point.