If there is a domain name / business plan you see and like, keep in mind it is not limited to original business scope of the developer.  Once you own it you can expand it in any way.

A few ground rules as to how things work:

If it where me buying a web based business I would keep the things in mind: When you make a purchase, it will freeze the venture that domain name.  Get all proprietary ownership dealing with the venture signed over to buyer (you) - Including intellectual property (Patents/Copyrights/TradeMarks ®), when and if applicable.

I would get a reputable third party (LAWYER) to collect all agreed proprietary property dealing with the domain name / business plan venture to make sure. .

That simple!

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