I'm at that awkward point in Team Fortress 2 where I have one of every weapon, but not the Poly Count hats or the resources to make them. (Well, strictly speaking, I don't have the Degreaser, but I'm not terribly worried about it.) For those who aren't familiar w/ TF2's item drop system, there are certain "Poly Count" sets for some classes, which are a combination of some weapons and a hat. The weapons can be found via the random drop system, but the hats never drop, so they have to be bought or made. The weapons can be bought or made, too, but buying them costs real money, and by the time that one has enough waste material to make them, one has probably already found them. The hats can be made with the crafting system, too, but this takes vast quantities of weapons to do. (For reference, a hat costs at least 3 Refined Metal to make, each of which costs 3 Reclaimed Metal, each of which costs 3 Scrap Metal, each of which costs 2 weapons, giving an effective price of >54 weapons to make a hat.)
If it weren't for the Poly Count sets, then I'd have no reason to even be thinking about hats prior to this point. But, of course, Valve is quite clever about this. The hats do nothing by themselves, but those that are part of Poly Count sets allow someone w/ a complete set to get some kind of bonus! (For example, Ol' Snaggletooth does nothing alone, but as part of The Croc-o-Style Kit, prevents headshots.)
So, the excitement of getting a new weapon is basically gone, replaced with the excitement of getting ANY weapon, since said weapon can be turned into scrap.
Well, on the bright side, TF2's crafting system means that nothing is truly wasted. Even when I've got all of the useful hats, I can still make all of the decorative ones. XD