This is a great response. I think the comment would caused hurt and upset to someone else, as it was making a judgement about your motives. In some ways there is nothing more hurtful. You responded using the power of choice and gave it right back to the commenter in another form. The commented mentioned you had a choice whether to choose to paywall your stories and you proved you had a choice which way to respond. I feel some people are begruding when they see other's trying to make a bit of money, even when it's only covering your costs for writing. It was an excellent response and showed respect for the commenter view. Great attitude to have also and helps in how one processes difficult situations they have no control over. When you take control of your responses it lessens control others may want to have over you, as you take responsibility for your actions and learn from others reactions. Reacting in anger would've had the total opposite effect.