Comments

your intentions seems very pure and objective -for your childrens or to enjoy it when you get the time to look back-. i would say that overcunsumption should be line-drawed when it really affects your financial situations and it is more for the quantity than its quality. me as you i would ask for a friend to check if theres too much or if its proportional with your desires. sometimes the look of a third can helps more than we may think.

I'd say overconsumption is buying just because its trendy and sooner or later you just stop using it or throw it away. collecting on the other hand has way more thought behind it you're buying it because you like it and you will take care and keep it for a long time 

For me overconsumption focuses more on trends and to buy that stuff really really quick with no or little thought behind it. Also it's things that you don't actually like that much too. A collection is build more slowly with thought what you want to buy and then maybe also focuses on the detail of the product or the quality. For example I like to collect Emma figurines from PopMart (?) and I don't buy 10 boxes at once, just one and then for like half a year later I buy another series of that. So in my opinion overconsumption is more quantity, collection more quality. 

(I'm also not saying Labubus, or stanleys or whatever else doesn't have quality.)