For many web marketers it is a dream to look on competitors and get information about their results.

 Let me explain how you can legaly get data about:

• Website backlinks.
• Incoming traffic.
• Clicks from search engines.
• Sales information.
• PPC earnings.
• PPC spendings.
• Targeted customers.
• Google Analytics reports.
• Copy from PayPal accounts.
• StatCounter information.
• Affiliate commissions.

 … and everything else you can imagine.

  You don’t want to hack and violate any laws, you just want competitor to show you everything. The only way to do it is to find similar website which are currently on sale and look on information competitor provide in marketplace. You can even contact him pretending that you are a customer and ask for more information as proof of profits.

 Good place to do it is SitePoint Marketplace where sellers attach all types of information as an image.

 For example: Today I found someone who is trying to sell his web store (health and beauty products). Seller attached copy of his Google Adsense account, affiliate sales, AwStat copy, information how keywords rank.

Right sidebar where sellers attach website perfomance information:

 As you see from screenshot above, it is easy to take a look on earnings, traffic, positions, soundings.

 Having this information you can manage your own website, take ideas, open new (copycat) websites. Believe or not, sometimes money could be in the niche you never thought about.