OCAT bus ticket to Kansai airport

Hi, i have checked the OCAT website and understand the timetable and bus fare. However, i know the bus ticket is not allowed to buy in advance. I have queries on below:
1. May I know are there many passenger go to Kansai airport by bus?
2. Each timing only have 1 bus or few buses go to Kansai airport?
3. I would take early morning around 6am bus to Kansai airport, would it be any problem to get ticket on the day i use?

Thanks
Nicole

The bus company provides enough capacity, so you can assume that there will be enough space.

I don't know whether my answer is too late and u hv been to Jp. This mode of transport(OCAT bus ticket) is very reliable, cheap, punctual.Are there many passengers, i will say depends whether peak or non peak period. Just make sure u hv enough time to board. However when u arrive and the bus is full,u can easily board the next bus. Just que up (first come first board)