If it’s “Substitute Teaching?” by Amanda Yuill, definitely, YES – she writes, shamelessly!
If it’s a resource you will refer to or be able to use over and over again, yes.
If you have a big house, with lots of storage, then sure, why not? Come to think of it how do you have a big house with lots of storage as a Substitute Teacher? Did you already make your fortune and now you’re doing something that makes a difference?
When I was younger, I bought lots of resources but I found I didn’t use most of them before they became obsolete. Most of what I need is found in any school or in the library.
If it’s a resource for a classroom, then I usually say no. As a Substitute Teacher I may never teach that grade again and I don’t have a huge house with lots of storage. I’m planning to make my millions later…please buy my book! Although I do have a few favourite children’s books that I use in lessons over and over again.
The problem is, if we keep buying things for the classroom, we pay the consequences for a broken system instead of allowing people to see how it’s broken and moving towards getting it fixed.