All your railroads are having the same size tracks.
I share the same experiance as you. I am not going to spend my time and money to support Netscape(AOL).
I use Mozilla. When presented with a website that does not render properly - an occurrence that has lately become quite rare - I do not go out of my way to load IE. I have absolutely no desire, or need, to jump through hoops. Instead, I simply take my business elsewhere.
I don't expect a 'webmaster' to develop custom pages to support every possible browser, but I do expect adherence to industry wide standards and the avoidance of unnecessary proprietary cra features. For the same reason, I am also not likely to do business with a store that employs no English speaking sales people. Spare me the Arabic, Chinese, Spanish, Ebonics, MS specific tags, etc.
I have personally cancelled thousands of dollars in purchases from unfriendly websites, and have instead done business with their competition. I have also recommended the competition to a significant number of other buyers. Driving customers away is no way to run a business.
It has become very easy to find multiple sources for products. If you cannot, or will not, produce a website that caters to all of your customers, your competition will (and is).