There is also a large number of SE Instructor rated airline pilots out there who would love to renew their ratings and do a bit of part-time instructing on their days off.
They are, generally, unable to do it as it affects their Flight Time Limitations/days off requirements (as stipulated by the CAA as it is classed as aerial work).
An airline pilot, on his day off, is unable to do a 30 minute trial lesson but could drive a taxi for 12 hours to help pay off his training loan. Which is the more stressful/tiring?
Experience that could be put to good use is lost to the light aviation fraternity.
Bonkers.