<prompt> Human: So in the spirit of learning from others mistakes, what is the costliest mistake you have made financially?I have been lucky myself, but when I graduated college I wanted a laptop, but not just any laptop, I wanted a top of the line Alienware laptop. I ended up spending 3,500 on that thing and it only lasted me about a year. Since then Ive had longer lasting laptops that only cost me 400. I know 3,500 isnt exactly a huge mistake, but like I said Ive been lucky.So lesson learned: Computers suck at holding value, and arent worth more than about the minimum you can spend on them.How about the rest of you guys? Whats the costliest financial mistake you made and what have you learned from it? What can the rest of us learn from it?In an effort of not repeating I did a search for similar posts but the only one I could find relating specifically to finances was this one which is a little limited in scope.  <response>: Got a credit card straight out of highschool. Always paid on time and paid it off at the beginning of the year. The kept raising my limit. I kept maxing it out. Never missed a payment. Then 8,000 dollars later, I lost my job and my minimum was raised to 500 a month because of that credit card fairness act or whatever its called. I was young and dumb. Im still dealing with it. But I learned a how to manage credit cards, the hard way. 