Is it possible the cost is reflective of the fact that they won't sell as many VP180's as the M80's? Even if they get the same number of orders for each, the physical number of M80's being manufactured is still double that of the VP180 because the M80's are sold in pairs.
Also, there will be a number of people will still choose a different centre as well as those individuals who just want a good pair of stereo/two channel speakers, so there will always be substancially more M80 Towers sold than VP180 centres.
