The business models in enterprise have changed pretty dramatically. A huge problem with enterprise software traditionally has been usually you sell to the customer and then they adopt the technology. The great thing about 'freemium' and the new way enterprise software is being sold is you get to try it first and then buy it.
Mint's business model became, 'We'll go for free, and then we'll find these savings opportunities for you.' You know, better interest rate on your credit cards, when should you consolidate your student loans, when does it mathematically make sense to refinance your mortgage, and Mint figures all that stuff out for you.