IMNSHO, TLD suffixes (.com, .net, .biz, etc.) make very little difference as far as placement in the search engines, or whether people visit your site or not (heck, most non-technical people wouldn't even know the domain name if you asked them -- they wouldn't know how to find it)
But, domain appraisal services give extra weight to .com, for no sound reason that I can understand.
Unless you are a known name brand (like ToysRUs, or Sears, etc.) most people just type in search terms, and either go to the site the browser chooses, or chooses from the search results.
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