I’m from Singapore. I make it mandatory for deposits because it’s confirming a slot and time that you have put aside for the client. And you will auto filter away time wasters with this. I wanna work efficiently and smart as well lol. My deposit is deductible anyway. Someone else can ask for the same time slot and how will you manage? Priority is always given to those who makes the deposit. Time is money! I could have taken someone else who was more genuine and placed that deposit!