I used to buy all sorts of unnecessary junk when I worked at this one drugstore chain. We got an excellent discount (cost + 10%) so I'd go crazy (Hallmark greeting cards were only 55% of the retail price). I'd also buy "interesting" things that were marked way down right before inventory (so that management wouldn't be stuck counting them -- usually things that were samples left by sales reps). Anyway, I still have many MANY greeting cards I purchased from there 20+ years ago when I worked there (I gave them all to DH about two months ago to see if he thought he could use them or if they should go into my donate to Goodwill pile).
I still haven't learned my lesson in not letting a good sale get the best of me. I, yesterday, saw the coupon from Michael's for 40% off my entire purchase of regular price items and kind of lost my mind earlier today. I wasn't planning on it but did manage to spend just under $100 for lots of things I really didn't need (cake baking and decorating supplies). I think I lost it at the featherweight bags (canvas bags are too hard on my wrists; parchment bags and disposable plastic bags allow too much warmth from my hands). This is after I put a bunch of stuff back on the shelf after asking myself if I really needed this stuff now (like luster dust and sugar sparkles). Mind you -- I just do this stuff for fun, and I don't even decorate very often so some of the stuff might go back (although I think I might exchange one icing color for ivory if I can find it because I want a gel color that is close to skin color). Am so glad I didn't know the coupon had been extended to be good all day long because I might've completely lost my mind finding many more things I don't need at all (was originally going to buy some cake pan sets but decided that I will wait until I see 50% off coupons for those).
Someday, I might like to decorate cakes as a side business, but I'm still in the middle of moving from my old house (taking forever) so I can't focus on it right now (next year is a realistic goal). Still, I bought ready-made fondant, color-flow, meringue powder, piping gel, etc., in the hopes to work more on these things in the near future.