Deals: If you see a deal on something that you have been wanting for a while, go for it. If it is a tool, go for it.
If you are not sure, then do not do it. Why?
Guidelines for purchasing things
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Most stuff is not worth it.
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It is easier to get into something, than to get out. That is, buying something is easier, but returning or selling afterward is more difficult.
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If it is not a "hell yes!" then it is a "no."
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You have survived until this point without it, you probably do not NEED it.
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Oftentimes, people buy the dream of something, instead of actually trying to do the thing. Buying outdoor equipment instead of camping. Buying tools instead of actually doing projects.
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Instead of buying something because you think you will use it, make do without it: use other tools you have, or borrow something. Make it a game. You will figure out whether you need it or not.
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Realize that there is a limit though. Where doing the thing in an inferior way begins to really impact the ability to live a good life.