The money you have to lay out to complete a master set is just not worth it to me, I just collect the base set and any insert sets that I like the look of. With the Traders for example, I will only collect the base set, retirees, the premierships and one young gun card which will not cost alot combined if I keep an eye out for decent prices. I started watching footy in 1988 so this is the year my collection begins and I only buy cards that are appealing or significant to me, be it childhood memories or current interests such as signature cards (top prospects, future forces). Don't sell your collection though, they could be a great hand-me-down for children or grandchildren or wait until you retire to sell them.