Do not expect to get any support with this product at all.
Personally i would rather PAY for something and get answers to my questions then be completely ignored on their forums.
K2 is a FREE extension. It's community supported. Saying K2 is "bad" because you don't get any support is like saying e.g. Joomla! is "bad" because no-one replied to some question of yours in the forums.
If you ever wanted premium support, you could have used the forum board dedicated to that. You simply post what you want done by some professional and people get in touch with you.
I would honestly consider what you wrote if you didn't have the option above, but you do. If you're getting paid for the site you deliver, you should also consider paying people to help you out.