Is there an expression or phrase to describe the misguided behavior of believing that purchasing an item relating to an activity you wish to pursue will give you the motivation to actually engage in that activity?
For example, a person who never jogs outdoors purchases an expensive treadmill, thinking that purchase will be the impetus to make them "a jogger" rather than simply going for a run outside and maybe buying a treadmill sometime in the future, after they've stuck with it for a while.
Or a person who never bakes will purchase a top-of-the-line stand-mixer, believing they'll begin baking once they own the proper tools, even though they could have baked a cake with the equipment they already owned.
The implication here is that this is a false premise; if you don't run or bake now, you're unlikely to make it a regular habit just because bought a fun new toy. You've made an unnecessary purchase and you still aren't engaging in the activity in question.