Many of us are too eccentric with our stamp collecting - the areas and types of philatelic material that we collect - viewing others not confining to our perception of collecting as wrong and weird. Philatelic material comes in different types - mint never hinged, mint hinged, postally used, used, CTO, definitive, commemorative, special, thematics, MS, sheetlet, stamp sheet, uncut sheet, imperforated sheet, presentation pack, FDC, cover, error, block-of-4, block-of-6, cylinder block, traffic block, gutter pair, wallpaper, illegal, unissued, annual album, aerogramme, postage due, revenue, overprint, reprint, surcharge etc. For me all these are collectable in one way to another. Different people might have different preferences, and we should not impose our righteous on others what to collect and what not to collect. Contrarily, we should celebrate the diversity of types/areas of stamp collecting.
Stamp collecting is supposed to be a hobby bringing you pleasure and fun. Emphasizing too much on monetary reward from stamp collecting is disastrous to the hobby. Just take stamp collecting like other hobbies (such as football, going movies, photography, travelling, drawing...). One needs to spend on hobbies, and that the hobbies shall bring you happiness. However, spending accordingly is the key for a healthy hobby.