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I tried to sell a domain recently to a large corporation and the TA was just awful . . . they wanted me to agree to WAY too much stuff for the little amount of money they were offering. I can understand that they wanted to cover their hinders, but it was so complicated I couldn't afford to pay for a lawyer to review it.
Selling a successful business is much more complex and you need a good firm of Attorneys to handle it for you.
Domain names.....($2K to $100K) use the NetSol Service. Businesses ($100K to $millions, use a good commercial law firm like H&K).