Things people Sell That we wish they did not

I was searching through a website looking for affiliates to sponsor my website, when I stumbled into a few software companies that I found to be a bit questionable.
Like a website that sells a captcha code breaker
Or another website that sells data mining software
Really? They can sell that stuff? people actually pay for that stuff? i mean the cost is low, but what is the risk of getting yourself into some trouble