The average rate for a continental based SFI is €500 per session: €600 for TRI/TRE. Self employed. That has been a rate for a long time. Inflation seems not to exist. There have been offers for SFI from northern & southern ATO's at €250/session + travel & basic accom'. Derisory beyond belief.
A friend in SIA is on U$600/session + travel & accom. The same offered in Hong Kong. It is the rate for instructors versus junior pilots that causes me pain. A session is 7 hours, so €70/hr. My plumber & electrician charge that. Nothing wrong with them, but it's not for weekends & night shifts, nor the experience & time taken to become TRI/TRI/SFI.