And once those new customers tell their friends and relatives how they found your website, more people will know you made sure to make it ADA compliant. The fact that you put this effort into ensuring everyone was included will set you apart from your competitors. Therefore, making your site ADA compliant is a great way to get some positive press for your business.
The gray area is a matter of scale and purpose. If you have a small business which serves as specific market it's a good idea to make the site as user and disability friendly as possible. If, however, your market serves segments with a likeliness to have various handicaps or disabilities you should address that with an ADA Compliance review of the site. Also consider the scale and purpose of an organization. Publicly traded large businesses need to concern themselves more than a single location family owned retailer and if someone sues your flower shop because the text was too small or didn't have "image alt tags" causing them distress... That's pretty frivolous and would likely not stand.
Many web developers have already realized this too and are exploiting business owners for $3k-$20k to make their sites compliant because they have no choice. So we came up with an extremely low-cost solution so everyone can remove themselves from risk, have compliant websites, and immediately. My website iFuzeMarketing.com is compliant. Visit it, press the handicap widget at the top, and play with its simple functions. We can custom build and install one for anyone's website that's reading this. It will deliver all the same functions, and we'll code it into your site for you so you don't have to worry about this risk any longer. Everybody needs this. Feel free to contact me for details if interested.
Yes, all websites must have hand rails in the rest rooms, ramps in lieu of front porch stairs and elevators with doors wide enough for wheelchairs to be easily loaded into them. Seriously though, ADA only covers Americans, and the Internet is hardly just an American institution. Besides, browsers can already be configured to override the web designer’s pre-configured fonts, font sizes, font and page and page background colors, etc, to make it much easier to read. Also, the big 3 Operating Systems (MS Windows, MAC, and Linux) have text-to-speech programs which will allow the computer to read...
Most recently, however, pizza chain Domino's has been brought under suit for their website not being accessible for specialty ordering. The U.S. Supreme Court refused to review the case, instead upholding the decision of the 9th U.S. Circuit Court of Appeals who said the “alleged inaccessibility of Domino’s website and app impedes access to the goods and services of its physical pizza franchises—which are places of public accommodation.”