Maybe Dropbox is serving mostly smaller companies, which have just a few users are therefore not so price sensitive. If you have five guys, then it's still just like $50-100 per month, not really worth the effort to start thinking how to save money on that.
If you are an enterprise with tens or few hundred users, the monthly bill starts to be in a range where it actually makes sense for somebody to spend a few hours to see if you could cut it by xx%.
If you are an enterprise with tens or few hundred users, the monthly bill starts to be in a range where it actually makes sense for somebody to spend a few hours to see if you could cut it by xx%.