Would I get ban from not using it? because I just got my YPN 2 days ago but I still not decide to use it or not. What happen if I don't use it within a week? or a month?
If you've used your beta certificate and made an account you should be fine. I made the mistake of not clicking the link in the email right away when I got accepted, thinking it'd be better to wait since my site wasn't ready yet. Then when I went to use it several weeks later it said it had expired and that I needed to apply again! Now I'm trying to get accepted again.
Inactivity could get your account closed. I know Yahoo. They closed my email account for not using it longer than several months. The reason is simple. There's a cost to keep the inactives. One takes a bit of database space; many take a lot of space.