Well there is nothing wrong about charging money for an adon, but maybe you should make it work first :/
1. Chat window is buggy, just white... http://gyazo.com/1bb226a5051b0ae9434d41ac5fb2f85c
2. while the windows still shows "Connecting you to a sales person. Please be patient." the chat disapeared in the backend
3. one chat with another person still is open after 5 minutes even if he left the site (closed the browser) and there is no option in the backend to close the chat. so i cant iniciate a new one...
also it just doenst look nice... i am not a fan of to manny options, but a little slicker look would be nice.
It seems more that the autor is trying to make a quick dime here than to deliver a good plugin (and yes i have spend a lot of money on plugins and donating aleready.)
Sorry for this harsh review but its rly disappointing