Its all about the money, we all use private proxies to get exposure on the web and make more money.
Use your private proxies with SEO tools like Scrapebox, Sick submitter, SENuke X, Bookmarkwiz, Zennoposter, Bookmarkwiz and others to get backlinks and rank better in google searches.

Start a social media campaign on Twitter with Tweetadder and Tweetattacks on Facebook, etc.

Post advertisements on Craigslist from anywhere in the world. Upload videos on youtube.
Bypass limitation on users from certain countries, cities, geographic regions or even restrictions on some ip address ranges.Get access to blocked sites and unblock any site you want such as Bebo, Youtube, Facebook, Friendster, Hi5, Orkut, eBay, Xanga and many other sites! Bypass any firewall or Internet filter and browse the Internet anonymously and undetected at work, school, college or university.