It's advice to all who read this! And perhaps it doesn't apply to you but many arrangements pay for hour worked and if you don't show up, you don't get paid.

Even in your case, if you cannot get to your place of work, certainly you wont be able to do your job, so someone is losing out. That is your employer and his clients or your clients. If we have an arrangement where you have to be somewhere and I was paying you for that but you don't even show up, why should I pay you?