You used to be nice, but now you rip people $50 and walk away because you "didn't sign a contract". They asked you to create a plugin after they paid you, but despite this you apparently couldn't do it and made them pay for the plugin from another person, even though you state you're a good developer?. I know every developer has something they can't do, but considering the fact they paid you $50 and that a shop plugin is literally not that hard to make, you should be able to make it. You used to be nice. So nice. Why did you change? Remember?