I don't make software service purchasing decisions for any companies, but I am always irritated by claims of "unlimited" for things that are very obviously not unlimited. "Unlimited vacation days," "unlimited cell phone data," "unlimited storage space," etc. all seem to me to be precisely what you said they are: ways of obfuscating the limits. You're not going to keep paying me if I take a 2 year vacation, and you're going to cut me off pretty quickly if I start piping /dev/random into Dropbox.