your stable job pays you a salary. its understood that a stable job is far better than doing gig work and as such, will be payed less, to account for the stability. To work an extra shift as a sub, one would need to go out of their way to accommodate an unknown boss, at an unknown school, with an unknown amount of work with students they are unfamiliar with. It is expected that all of these negative would detract from anyone wanting to actually work a sub position, so the own must make some concession for finding a teaching willing to do this kind of work. A teacher can work a short time gig for 30-50,000 per hour, so why would they do the same work at a hagwon for a day for any less. I work an extra job. Its 2 hours in the morning, every day. For this I'm payed 1.5 mil a month. I think that works out to about 35,000 per hour. I was willing to take less than the 40-60 i would normally get for doing gig work because it is so regular, guaranteed, and something that i can grow used to doing.
For example, if someone had to take over your 2 hours morning class, (assuming you did all the planning and what not) would your employer pay that sub teacher more than what you are getting paid now?
Just curious? Is the OP here the same OP who made the original post in that Facebook group?