Well if TPs are so great why is the much highly regarded BA farming out the IOM ops to a S20? How do 'premium' carriers like Eastern, Porter and Skywork survive?
I remember when the SYY-EDI route was operated by a TP. A competitor started, charged up to 50% less. Yet people didn't suddenly switch. The jet lasted less than two years. Despite it being cheaper, and a jet. People may prefer a jet, but I doubt many people change their plans based on what equipment is used.
I have my favourite types but I go for price and schedule, as do most.