Nothing, it won't affects your account. it will be a problem if you use 2 accounts on the same IP address
Wrong. You can use 2 or more accounts on the same IP address, it's not against the rules. Theorically, you can use as many accounts as you want on same IP address as long as you not breaking any rules of Bitcointalk.
True. Multiple account is allowed, so there is no violation of using different accounts in a single IP.
It's nothing wrong to use different IP's, you aren't breaking any of Bitcointalk rules.
This is policy of Bitcointalk - some people want to stay anonymous, others want to avoid censorship and this is why people are allowed to use dynamic IP adresses, Proxy, VPN, Tor to access Bitcointalk. You wont get permaban, don't worry.
Using Proxy, VPN I think is not allowed you will get ban if you open your account in VPN and proxy.