That said, you'll find no argument from me that startups should sell money. Ignore the "you're giving your work away for free" angle -- the world at large and your customers in particular don't give mouse droppings about you, they care about themselves and their life and how your product improves those lives.
Charging money helps your product improve their life. It communicates value -- it automatically sets your product above 99% of the Internet because 99% of the Internet is free and everyone has learned by experience that most things that are free are free because they provide less than one penny of value.
Charging money gives people the confidence that your website is on the level. You have a clear rationale for providing the service and for being around next week. It is amazing any commerce on the Internet happens at all with the pervasive lack of trust people have for new websites. Asking for money (combined with many other things you'll be doing while asking for money) helps to build trust, by giving people a familiar, comfortable role to slide into in their emerging business relationship with you. They figure "Hey, if I pay them money, then I'll be the customer, and customers typically get what they want."
Charging money tells people that if something breaks (and something always breaks) that you'll be around to fix it.
Charging money says this product will merit future investment. Charging money says this product has a future.
freemium project is freemium because it is more time and labor intensive, as well as resource-intensive. if i didn't charge, i would be in debt.
the free one is free because it is simple, easy, many times less resource intensive, and i can devote as little time as i want to it while it still generates me some revenue.
Since we are monthly subscription based we figured out a good price point that would make us profitable, yet undercut our competition by a wide margin.