When you take time and effort to produce something, you have created value. It's your call as to how much value, but unless your time -- aka your life -- is free for anyone's as-they-wish use, what you create is worth something.
The only people who legitimately want things of value for free are those who have never created anything, and/or never had to pay for the things they own of value.
There is only so much time in a day, only so much energy to expend, and only so much effort to give. We each have an amount for ourselves. Set your prices wisely.