I would say there are two types of collector - the investor and the true collector.  One collects for the money they will make reselling a coin, the other for perhaps the history, or design.  I'd say I'm most definitely a collector, but would like my coins to make me a profit if I sold them, fairly obviously. I had always dabbled with collecting since a young age when my great-grandfather gave me a collection of wartime European coins, from when he was in the army.  He built the "Bailey Bridges" across North Africa, Italy, and all of Europe, so there was a heckuva lot of scope.  He also had banknotes which I also liked, but not half as much as the coins.   When I started buying coins, I started making random purchases of anything which caught my eye for under book price.  In this phase, I bought such diverse things as a Cartwheel penny, George II shilling, Victoria Double Florin, and an early Victoria Penny.  Afterwards though, I realised my collection had no direction, so I started to concentrate on farthings.  Whilst plodding my way through this series, verdigris appeared on some other copper-alloyed coins, so I had no choice to sell my farthings, to Chris of all people   .   After that I was at a loss as to what to collect.  Sylvester suggested half-sovereigns, I thought perhaps maundy money.  But I had always had a penchant for George IV coinage, and so embarked somewhat ambitiously on an 1826 set.  So far, I only have the shilling (!) but I am immensely proud of it.  I'm reappraising maundy money and I really really really want a James II set    Unfrotunately, the only way I can complete my George IV set is with the copper coins (and thego,d of course which is highly unlikely) so I may have to resort to buying *shock horror* slabbed coins.