There are many different types of collector, from a coins type to a coins grade. A collector can focus on an era (ie: collecting only George II types) and from that a collector can also focus on a coin type from an era (ie: Farthings from Charles II, and Half Crowns from Victoria). The motivation to start collecting can be from anything, with me it was recieving a bag of predecimal coins from my great uncle. It can be from being left some coins all the way to seeing an advert to buy a coin that could come through allong with junk mail in the post. I would say that more satisfaction is achieved in the collecting not the 'having collected', mostly because it is a challenge to collect. But on the whole, collections are never completed (ie: 'the other man's grass is allways greener' ).