There are lots of folks who have made millions on internet companies.
Meet Spencer Haws. This dude owns nichepursuits.com. He also owns the company who made Link Whisper, a very wordpress plugin. And he also owns, Motion Invest, a website buying and selling marketplace. All his assets combined, his net worth is easily above a million.
Meet Anne Moss. Started web publishing since the early 2000s. Now she owns a web publishing enterprise of more than 30 giant sites. Together her portfolio of websites bring her anywhere from $40,000 to $70,0000 per month.
These are just 2 folks I can remember of the top of my head. You can easily find several more.