I buy my coins because i like to trade. It's a small adiction of mine.
Sometimes I'm lucky, sometimes not.
I also buy for the trade and for other different purposes, but it is not my adiction, and I think it is not addiction of any person but is a need as earning some money is the intense demand of the day to support our family.
I don't see any bad result of buying bitcoin as long as you can afford it(not even an addiction in my own opinion). I think it will be better for you if you hold bitcoin as much as you can so you can profit more.