In general about 50 messages a month.

Yes, russian is my native language. Why do I sell it? I need money. 

To tell the truth, some users at Armadaboard take $150 a month. Surely in case of  an advanced payment for 3-6 months there is a discount.

Also you can place up to 6 ad spots at your signature. In this case the price is also lesser ($50-60 each).

The price is oк. That's an average price for renting signature. For exampe, if you'd like to place ad at this forum officially, you'll have to pay 100-150$ for 120x20 banner which rotate or 700$ a week for a big banner at header.

Look at the prices: http://www.armadaboard.com/pr.html

Hello. I'm selling ad space in my signature at a biggest Russian-speaking webmaster forum Armadaboard.

Here is my profile on the site: http://www.armadaboard.com/profile.php?mode=viewprofile&u=52278

The account is 6 years old, 2500 posts, perfect reputation.
The price is $100 for a month.

Contacts: strannik1strannik@yandex.ru