My point is that Eastern have priced themselves out of the market - return flights BHD-IOM with Flybe via Manchester cost £130. Imagine what Flybe would charge if the flights were direct - easily under £100 return. Even with Citywing in operation I always found it cheaper to use Flybe by a substantial amount.
Your comparison is a contradiction to the point you're trying to make - it costs £40 to travel 150 miles, but then £99 to travel 70 miles. Therefore it would be much cheaper to get the train from Newcastle to Liverpool, and then fly to the Isle of Man than to fly direct.