Thing is even if i can get $5 back on $10 purchase I still spent $5. So we need to ask do we REALLY need or even want the item. We have to ask:
1. Do we already have something that works?
If so, does the old one still work? IF we get the new one are we willing to let the old one go? if the answer is no, why? If it is because it cost a lot and the old one still works, can you continue to use it? If you really need a new one because the new version has features you need, can you sell the old one? If you cannot part with the old one, then perhaps that is a clear sign that you do not need a new one.
2. If you don't have one, then you have been living without it, can you continue to do so?
Do you already feel crowded in your space? Perhaps you think of something(s) that take up twice as much space as the new item to purge from your stewardship! Yes, you have to look at it in terms of space, you cannot acquire a yoga ball (even a 'free one) and give up a marble. In addition to the economics of space and money, you have to consider time. This new item will take up some amount of time in your life. Even if it is just a knickknack, it will take time for you to clean around and dust it, is it worth it? Are you already feeling overwhelmingly busy? You have to assess how much time that new item will take to make it worth buying and then decide if you have that much free time to fill. If you don't have free time, what other activities and their accouterments are you willing to part with to make the time to use the new item. If you really want new golf clubs are you willing to quit racket ball to free the time to play, and get rid of that equipment to make space and free up funds to join a golf club?
3. Do I have the money to spend on this? If so, is it worth it? I am willing to work at my job for 30 hours to buy a new lap top when the old one still works? Will I regret not having the money to spend on something I do need or really want? In my case I have to ask, is it worth my husband spending 30 hours away from his family. If my kids suddenly need medical attention will I feel like I made a mistake buying something I did not need.
If you don't think its worth going through the hassle of asking these questions, then it probably is not worth your time to earn the money, and the space it will take up in your life!