As others have said, do this.
That's all well and good unless:
1) It's impeding on your ability to manage your finances (such as repaying loans).
2) Usage (whether that be active play or even just static display). Do you have the space to display it all? As Zippo says, a lot of what he has is in storage which he hasn't even seen in a jolly long time. IMO if you haven't even looked at a toy in over a year or so, then what's the point in having it?
Being a completist is one thing, but when it starts affecting your life in an adverse way in terms of finance and just wasting space (which is really what cold storage is, as opposed to more meaningful uses of space, like display or 'warm/hot' storage (i.e. the toys are stored in boxes/containers, but are taken out for use occasionally (say at least once a year -- any less than that and your Xmas tree is seeing more action than your toys!).