Why the truth is not in them ??

I wonder how many people have been told something by a buyer, that was no where near the truth....I hate to think how many times I  have been told that I will send a Pay-Pal tomorrow, or I'll send you a check tonight....and never do anything of the kind.....I've been waiting for two weeks for a check from a guy in Michigan  , I have sold a item 13 times on another web-site based on what a person has told me and never received the first penny..........Does anyone tell the truth anymore ??   I have one web-site that I do business on that has a 98% negative truth rate.....Isn't that a poor way to deal with people ??     What are your experience ??