Simplicity is really easy to charge for. Tons of people want to pay for Dropbox because it makes getting files places easy when it wasn't before. Simple, on th

Simplicity is really easy to charge for. Tons of people want to pay for Dropbox because it makes getting files places easy when it wasn't before. Simple, on the other hand, is very difficult to charge for. If you can't demonstrate a substantial amount of added value, people will want it for free or won't use it at all. And if you do try to charge, competitors will come in and quickly replicate what you've got, but undercut you.