Why do some corporates hate small business?

Yesterday I lost a few hours trying to figure out how to use my google apps email address as my openid account, because I don't use my gmail.com account. I give up, forget about openid and any website that requires me to use it.

Today I spent an hour and a half on the phone with AT&T Small business, for the 6th time in 2 years attempting to get access to my AT&T small business portal. I gave up and decided to leave AT&T.

Afterwards I spent an hour and a half trying to figure out how to get a business account from Verizon. I gave up and looked at Sprint. 30 seconds later I found http://bit.ly/cDQhU6

What's the deal? Is it that companies who sell to both b2b and b2c are inherently too disjointed to provide quality service to both? Or does sprint just care more about business accounts than AT&T or Verizon? It feels like every single time I try to use a vendor who sells to both I run into more friction than I'm comfortable with. 15 minute transactions often turn into hours of wild goose chases.

These sorts of inefficiencies just can't make business sense for anybody involved in the transaction. Every hour I waste on frustrations like these says to me that my vendors don't care if they waste my time or win/keep my business.