Sasaki-sensei is trying his best to thanks the students but it seems like he always ends up using more than one page
The situation is correct. Thanks are not always enough to repay some people. They do so much for us that just thanking them doesn't feels enough.
But don't forget to say thank you to people when required, it may sound simple and sometimes boring to say that, but small words like these means a lot to the others and can brighten up their mood. No price can show the same happiness others get from just a word,"Thank you!"