There are many yeshivas that have a work-study program. Basically, the boys (this is usually done for beis medrash guys) who can’t pay full tuition, are assigned a job in the yeshiva, such as turning off the lights at night, serving food at meals, organizing the seforim etc. This saves the yeshivos a lot of $ because otherwise, they would need to be paying people to do these things.
Instead of the yeshivos having a recycling program which only will give them a few dollars, by having systems in place such as making sure the lights are off at night and the air conditioning/heat is not on in rooms that aren’t being used etc, the yeshivos will save A LOT more $ then recycling a few bottles.
Its sad but There are yeshivos that have MANY parents who are paying very little in tuition and who just don’t help out at yeshiva events etc.