Well put, SsuperDdave. If you buy the classic commems, do it because you like the coins, not because you expect to recoup your money next week. Come to think of it, that is advice that applies to all areas of numismatics.
And that brings up another point. Don't spend all your money on coins. Set a budget and save some money, people! I can't count the number of friends, customers, even other dealers who are constantly robbing Peter to pay Paul. If you have a bit of reserve in your accounts, there will always be nice opportunities to buy coins. If you spend every dime you've got, you won't be in a position to capitalize when a really good buy or that coin you simply must have does come your way, or else you will have to sell Prize B to be able to afford Prize A -- not a great way to build a collection! Sorry if I sound preachy but have learned that lesson the hard way myself.
Happy New Year to all!
Best Regards,

George