This is a great question! I have two different answers. For "everyday"-ish bags, my purchases are planned, because I know I'm going to use the dickens out of them over the years and will accordingly spend as much on them as I can justify. I love seeing from others' responses that I'm not alone in the world in being a Design Geek at heart who just enjoys carrying something every day that is well-made, with pleasing proportions and thoughtful features and top-quality materials, in a color I love.
But for "incidental" bags--little clutches/formal bags, or utilitarian ones to take to the beach or to see a band--it's impulse all the way (and with a waaaay lower price limit)! My favorite formal bag, as an example, is from the old fall '06 Behnaz Sarafpour for Target capsule collection--I use it maybe once a year, but it was maybe $30 so who cares, and it goes with 90% of my cocktail/evening dresses and inevitably draws compliments.
One other thought: I admittedly have obnoxiously bad OCD and ADD, and as such I almost never wear jewelry because it distracts me and drives me BANANAS. So, for occasions that would lend themselves to buying some commemorative piece of jewelry for most women (like my 40th birthday, or when I received an unexpected inheritance from a dear late relative), I get an awesome commemorative bag instead!
But for "incidental" bags--little clutches/formal bags, or utilitarian ones to take to the beach or to see a band--it's impulse all the way (and with a waaaay lower price limit)! My favorite formal bag, as an example, is from the old fall '06 Behnaz Sarafpour for Target capsule collection--I use it maybe once a year, but it was maybe $30 so who cares, and it goes with 90% of my cocktail/evening dresses and inevitably draws compliments.
One other thought: I admittedly have obnoxiously bad OCD and ADD, and as such I almost never wear jewelry because it distracts me and drives me BANANAS. So, for occasions that would lend themselves to buying some commemorative piece of jewelry for most women (like my 40th birthday, or when I received an unexpected inheritance from a dear late relative), I get an awesome commemorative bag instead!