If you moved from a host with slow bw like cogent or nlayer you may see a 18-25% drop is traffic, thus less revenue. I recently had a back end media server at alpha red, I moved it to a good host that uses level3 and savis and it was like crazy my sales and traffic went up approx 20%. I couldn't believe it so I've talked to a few others and the same thing happened to them. I'm now convinced that I may really have been wasting money rather then saving by using a low end host. Oh well you live, you lose, then you learn.
