Are you comparing like with like?
Total earnings or hourly rates?
If a recent thread was reasonably accurate, student-pilots seem to pay about £40 per hour for basic instruction in the UK - even for a low hours newly qualified instructor.
Do people pay more than £40 per hour in the UK just for the driving instructor?
If they do, could that be because demand for driving instructors exceeds supply? I don't know if it does, just wondering.
Is it possible the supply of flying instructors exceeds the demand? If there are too many instructors chasing too few students, earnings will stay low.
In something as specialist as helicopter instruction, should there be a significant difference between the hourly rates of high and low hours instructors to reflect their experience - and give students the choice?
UK FI rates for basic training are already amongst the highest in the world - and much more than in the US which tempts many UK student-customers.
Is charging even more a good idea?
Just a few thoughts.