The dollar being weak would actually have no part in the rising of the cost, as since this is a globalized business, if the dollar weakens that actually drives more international business to the US as it makes it more cost affordable for buyers to choose US hosting companies. Plus because of the current financial crisis, the cost of energy is dropping greatly. In my honest opinion, unless they made some bad decisions that cost them money and they are trying to displace the expense, they are most likely gauging, I would seek out another hosting provider.