despite I already bought toriprime. I have toriprime but it won't let me buy VIP.
I tried exiting site and coming back again, it didn't help.

You can try contacting an admin and showing them proof if you have it that you have toriprime.

Yes. This was mentioned before. Just contact an admin about it and they will give you the ropes. Try the IRC.

Paraphrased?~By, Sir?

not sure what the cause of this is, but this link seems to work for people with this problem: http://forum.toribash.com/tori_boosters.php