I think realizing that a lot of it is hype and LE craziness. The idea of not being able to have something at a later point, I think, has a huge influence on purchasing. Think of it this way - if you knew this item was permanent and could be purchased at any time, would you feel the strong pull to purchase it? A lot of things are re-promotes too - sometimes I look at the clearance bin, MU swap/sales, etc. and see a lot of past purchase 'mistakes' in there. I mean, yes, we/I get to benefit from these 'mistakes' so that's great, but you'll never get back the full amount of cash that you spent on that item that you used a few times and didn't really love (for whatever reason). I guess it's not necessarily mistakes either, just growing out of products, changing skin/tone/colouring, etc. So really when purchasing I think it's important to consider many things - where can you wear this product, how many years of wear can you get out of it, can you wear it to work, do you already have something similar, etc. For me, I like a crazy colourful eye, but I'm getting into education so I might have to tone it down for a while (at least until I get a permanent job!) - so, do I really need Sassy Moss fluidline (which I was going to purchase?)? I have a stack of teal/blue eye pencils, so no, probably not.
@Audrey C helped me with that one
ETA: I will be swatching FOF in person because I don't want to make any purchasing mistakes - I might only leave with one item, or none, depending on how Phylox swatches.
I guess it's looking at your needs vs. your wants and checking in with your priorities for your hard earned $$$, which of course will be different for each of us. What's great is that this thread is a judgement free zone!