Sometimes we can be a sodding inconsiderate bunch. In the quest to find riches and fame we tend to forget the less fortunate that contributes to our wealth. That is sad...very sad in deed. We should be ashamed of ourselves. Many human rights activists are pressuring business owners to make their premises accessible to the disabled.
That makes a lot of sense. The disabled do use and buy stuff. In a way they contribute to the market revenue too. So why not be a little kind and invest in a few Stairlifts. For one the disabled will feel much more appreciated and by word of mouth they will tell their other disabled friends how easy it is to shop at your premises rather than the obnoxious Jack's place next door.
Don't worry about the shape of your stairs. There is just a design to fit just about any kind of stairs ever built. So, tap into that market...it might jut make you millions more~!