I don't know, but it kinda seems like common sense .. if you don't have much of a collection, and you are looking at a "big" purchase, then it would simply be a matter of "can you afford such a purchase" within the parameters of your life/your family life ? The one thing about accumulating a bit of a collection is that it gets to the point where you can "trade up" so to speak for that item that is "bigger" and "better" than what you currently have, and that will ALWAYS happen if you catch this collecting bug again. Either straight trading, or a combo of books plus cash.
But always buy within your means. It sounds simple and maybe stupid to say, but the temptation will be there often to overextend....take it from a current Canadian collector