If I was a customer I would pay around $5 and then would try to use as much space as I can... Well I wouldn't do it actually, but most of the customers you are trying to fish with this offering would do this. I have to say also that Shared Hosting has already gone "unlimited" so there is nothing to be ashamed of when you try to sell "unlimited". However I'm afraid that it is very crowdy on the overselling hosting market
My advice to you is to focus on any niche where you would be able to establish the company without being presses so much from the competition.
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It depends, basically on reputation of the company and the terms of service they offer. If it is a company that has too many restrictions on.., file count, CPU usage, memory.. i go for a low price some where around 6 to 9 dollars per month.
there is no unlimited thing. if you think are than go and check terms and condition of these big hosts.
your will find inode limit meand hard disk is limited.
you will see processing power usage / mins or seconds this means cpu limit
I hope you get some thing,
I am tired of unlimited unlimited! its only a marketing gimmick ok!