Oil on canvas

I have been longing to collect paintings on canvas for a long time n now i tink i'm starting to do so seriously..its a good long term investment..y? simply bcoz a good painting can be sold for a good price..a person can put a higher price for a painting even tho' the painting is cheap..like i have this less than $10 painting..a friend of mine put up a price of $80 to buy it..see wat i meant..