I'm guessing Yahoo Small Business is how they'd like to make money, but it's a bit of a legacy monster. Certainly very hard to get a customer out of and onto a different platform. Comcast Small Biz is similar confusing mess of intersecting control panels (maybe the same software?). A few other companies run the same game, getting business clients locked in complex setups, but I'm not sure it's even intentional with these players on the bottom end of the business hosting market.
On a similar note I called Network Solutions today to get a better domain renewal price, and the customer rep told me domain reg was no longer its main business and we should consider switching to another company if we did not want any other services. It's now Network Solutions,a "web-dot-com" company. They do still offer a $10 panic price though if you click for your transfer authorization code.