You have a few bits of interesting stuff, Opinion: $5 -$15 Australian I would expect in my neck of the woods. Then again, you may have a stamp worth $50 One can only know with years of experience and up close inspection.
Consider it like buying a house from a magazine picture.
In my view, Rod has been too optimistic. These, are 0.02€ stamps... If you find a buyer. Better, as advised, give to a child or donate to charity. If not feasible...There is always, the paper recycling bin...