For me, before i hosted on asurahosting, I also noticed that 21ghz and I know that it was just a marketing strategy but they have an explanation for it so it convinced me. We can't judge them by just this marketing strategy because what matters most is their service and they have it. =) Although there are times that Asurahosting was getting irritated when I'm asking for his help, he will still help me and the problem that i had that time was not included on the package that I bought. And so, overall rating for me is really high.
In my case, there are some hosting companies who provide good offers on hosting packages but does not have the good service which is really essential for a hosting company.
Thanks!