I bet when you started thinking about your product, the question of how to make money from it came up. Businesses exist to make a profit. They expect their customers to contribute to that profit. Sometimes, they contribute with more than just their wallets.
What do you think your users owe you?
Money, their attention and their time. They owe you their data and patience when things break or are confusing. Maybe you think they owe you feedback and reproduction of bugs they find. What about their trust and loyalty?
Unfortunately, this kind of thinking is wrong. Your users aren't listening to you because you're asking for their time, trust and loyalty. You have to earn those. The more you focus on this question, the further away you stray from them.
On the other hand, when you ask what you owe your users, you can already hear the wheels spinning. It's a wonderful world full of possibilities where you can dream up all sorts of things that would make their lives better in some meaningful way.
Now, you're taking responsibility for your product and the way forward. You're no longer thinking of yourself, your business and the bottom line.
Accessibility is the ultimate test of whether you're thinking about your users or just the average user. It's easy to build for the person you imagine. It's harder and more honest to build for the person you didn't think of. When you commit to web accessibility, you're saying that you owe this to people you'll never meet, who'll never email you and whom you'll never see in a focus group. That's what real responsibility looks like.
Take care of your users, all your users, and the bottom line will take care of itself.