Hokey
I have now accumulated a stash of 30+ kits and 1/2 have aftermarket already in the stash just waiting to be built.
After 40+ years of modelling I've realised that (for me), the more I spend on aftermarket for a project, the less likely I am to actually build it. Perhaps it's a subconscious fear of spoiling the model having spent so much on it, but I find I gravitate more to a straight-from-the-box build when choosing a new project from the stash.