I was looking at this plugin, and I have to say, it's VERY overpriced for what it does. Ten dollars is unimaginable for a plugin that just adds one minor feature!
As the creator of this plugin, I would disagree with you here. Why? Because $10 is no longer money in 2025 and you get to keep this plugin as well as alter its source code. Also, it took me a lot of learning to learn in order to create a plugin like this. You are paying for my training, knowledge, work, and expertise as well as the fact that you get full source code. I have actually thought of making it more expensive. Getting someone to write you this whole plugin from scratch would cost you much more here. RPG Maker (custom) plugins typically cost $500-$2,000 to sell to one person.