Well it is all over now a days. I can see several hosts selling plans saying,

(1)Unlimited Storage
(2)Unlimited Bandwidth
(3)Unlimited Email Accounts
(4)Unlimited Addon Domains
(5)Unlimited Databases
etc

This is very common. But I believe this is only to convince customer to take decision in their favor. Obviously nothing is unlimited. There are limits that even hosting company has to face. But usually those limits are not easily reachable hence it is counted as Unlimited.

I must say these are marketing tricks. They are not deceiving but trying to market their products as best as they can.