Have never had daily/monthly retainer. I get paid £15 per hour and £10 groundschool. My flying hour is airborne plus ten...which is often less than when actual when teaching new students. If you are paid by the Hobbs, then I reckon it is up to 14% better rate of pay than being paid for airborne plus ten.
This year I have done 250 hours instruction (semi-permanent/part-time) and my total profit after taking into account travelling expenses and accommodation is.......less than £500. and no I don't drive a rolls and stay in the Ritz. I drive a heap (like most FIs) and stayed in a caravan!
'twill always be so until students pay the proper rate for their instruction. Plumber £50 per hour. Laywer £100+ per hour. Part-time lecturer £30 per hour. Flying Instructor £15 per hour...plus pay own NI, medicals, revalidations etc.
I would do it permanently if it paid a decent wage.
Rant over.