The staff doesn't usually read, much less respond to, the forum, mainly because of the problem of discussing topics involving private data in a public medium.
This past month, one of the admins has been reviewing the forum to resolve some payment issues, but I wouldn't consider using the forum a "formal" way to contact the staff.
I agree that not responding, and especially not having a way to know if a ticket is open or closed, is difficult for users. But at the same time, it's difficult to ask the staff to respond to all the requests if you consider that there are very few of them compared to all the people requesting support.