under the strict parameters of allowable answers
No
having the kits you want to build for a set theme (a stash), is far less detrimental to the kits being built than any of the following
not having any kits to build
having a lot of kits, but, none of them fit your theme
there not being a kit of the thing you want to build for your collection
there once being a kit of the thing you want, but, it is OOP, and you can't find one for sale anymore, anywhere
there once being a kit of the thing you want to continue your theme, but, it is OOP, and there ARE some available,,,,,,but, they would cost more than the car you drive to get one today
there is a current version of the model you want, it is for sale today, but, you can't get one for any of the possible reasons for that happening to a modeler
not having motivation to build a model is rooted somewhere besides in "having the kit on your shelf at your place"
my own stash inspires me to choose a subject to start anytime I take a minute to look at it,,,,,the worst it could do is cause me to have too many going at once