Could be just a special promotion. We do the same thing. We will run double everything for a short period then go back to our original plans. Just depends they could of purchased new servers like we did this week and now are offering more space and bandwidth for a linited time. A server with with no clients makes no money so running specials will get new clients on the server so it is atleast making something.
They just opened their own data center in Orlando so maybe that's why they can do this? I don't know. I've been a happy customer for 16-months so I was happy about the new account allocations. They've been a great host for my needs these past 16-months so I trust they know what their doing even when they double their plans. They've earned my benefit of the doubt.