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WWhy are things on here so expensive?
Gold prices for items on Gaia are set by "the market" (other users that use the marketplace). Prices are pinned to "value". If you find items that are expensive, it's because the market believes they are valuable. There is also a supply/demand curve involved (supply for most GCash items stops at some point, supply for gold shop items will likely last a lot longer).
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and also why is the meebo keep changing?
Meebo is a product from a different company (the Meebo company... which was bought by Google just 1-2 weeks ago). Google bought the company and shut down some of their products. They also forced GaiaOnline.com to "upgrade" the Meebo Bar to the "new look".