If you have a big collection, sell them all now or anytime before you die. Then put all that money in a savings account. If you want, pretend eBay is YOUR personal stash, only you have to pay storage fees. Then, when you want to get a kit from "storage", pay for it on eBay from the savings account. Chances are, you will have a lot more money and less pressure on your family to rid a garage or storage room of all those models.
Plus, you can constantly post about all the kits you "have" "in storage".