Thanks for the detailed article. Running a web hosting company is really hard, it's like every day playing with messy situations. Your server may crash, and everything can go wrong, you will have no other choice instead of sitting in front of your PC, trying to fix the mess.
Clients will ask refund, to make things worst you did not set up any backup solution to keep your infra cost minimal. LOSS OF DATA.
Data Center can catch fire, like OVH or WebNX - without even your fault.
So Yeah! Entrepreneurship is hard, You will always have to be prepared for sleepless nights, tension, anxiety, and depression.
Welcome to Web Hosting Business!