Knowledge is king, do your due diligence on the item you are either buying or selling both technically and financially. When it comes time to list or buy you have confidence in making a good transaction. One lesson I learned the hard way, is when you purchase an item with the idea that someday you will sell it to upgrade or no longer need it buy something that will retain some resale value. Case in point: Bought a Triumph Trident 900 motorcycle years ago for a good price and rode it for several years and then decided to sell. It was in perfect condition with only 5,000 miles, but Triumph is a niche brand, not like Honda orYamaha, and appeals to a certain crowd so it took a while to sell at 1/2 of the original cost. Now only buy items that I have confidence in selling in reasonable time at mineable loss.
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