I used to buy bog standard stuff from Boots etc but I had MB in a really posh hotel I was put up in at a works award do,and loved it so went looking for some but was horrified at the price!I'm waiting for Black Friday. MB had great deals on last year and if I hadn't had a stash of kits from QVC, I would have stocked up on several bottles of my favourite fragrances to last me the year.
Then I was gifted some l'occitane and thought the same but then found an outlet shop... so that was the start of the slippery slope!
As my mum says, if you can afford it then buy it because you work for it!
It helps that I can justify it to myself because I never buy at full price, and I have a water softener so everything lasts ages.