eros is right --
I can tell you what will happen.. especially if you are relatively new at building galleries (and making $$$$$ with them !!!!).
Best case scenario you will spend the first week getting listed sparatically and slowly getting to the point where the server slows to a crawl. At this point surfers will not get your galleries and the TGP's will began pulling your links and banning your domain, or at least stop listing you!!
Worst case scenario is what eroswebmaster laid out for you where they will let you run it up and then turn around and either try to get you to spend a lot more money on a dedicated or simply charge you the money without any notice.
If you are not going to listen to any of us at least be very cautious and call the host and lay out these scenarios and see what there reaction is.
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Make $$$ the Diabolical Way