I am an avid stamp collector. So Many different collections to choose from. 
It has been a popular hobby as long as stamps have existed.  I've been collecting since I was 6.
Have you ever tried to sell any for profit?!
Unfortunately all the stamps I have are used so not very valuable past the proof of paymeny cost. 
Are there in hard to find ones that you are still looking for to complete a collection?
to a single denomination. At the same time, this break with the recent past represented a return to origins. Washington and Franklin, after all, had appeared on the first two American stamps, issued in 1847, and during the next fifteen years, each of the eight stamp denominations available (with one exception) featured either Washington or Franklin.
In the early Washington–Franklin issues (1908–11), every design incorporated a pair of olive branches surrounding one or the other of the two profiles. From 1912 on
not as if he said, "I must collect stamps so I, Paul, can obtain pleasure". Collecting stamps is not just a means toward pleasure. He simply likes collecting stamps, therefore (indirectly) acquiring pleasure.
This paradox is often reversed to illustrate that pleasure and happiness cannot be reverse-engineered. If for example you heard that collecting stamps was very pleasurable, and began a stamp collection as a means towards this happiness, it would inevitably be in vain. To achieve happiness, you must