Yes, I know you CAN make it work, but most people (noobier who cannot fix a white client) see the exploit and just remove it. Then the code no longer works as the class.template.php file has no {server_ip} code because it was removed for an exploit, not just secured...
I know you can change it...
One: Good luck with a "free VPS"
Two: Count me out... If you cannot sustain the hotel on a VPS from the start, then how do I know I wont do loads of work and you just host Hamachi...