Not sure where you are looking, there are currently 70 registered sellers listing everything from horses for sale, tractors and machinery, B&Bs, wool, livestock etc. There are close to 900 members total, 95% UK based. Few in France and handful in Bulgaria.
There are many ads on the site. The sponsor ads on the right hand side have been purchased in the past by larger agricultural companies in the UK. They get much more than just an ad on the site.
Gofarmer has been featured in many publications. It has helped many people successfully sell their items and promote their business.
The cost was 45 pounds a year to list as many adverts as you want in that period, there is no limit. So 45 pounds is actually great value. Where else can you advertise as many products as you like for just 45 pounds a year. However, there is a 5 pound introductory offer, so your first year is just 5 pounds and then subsequent years are 45 pounds. This gives you the chance to test the site for just 5 pounds for the first year and if you decide it is not for you, you can cancel before the payment for second year is taken.
As a member you can also send in details of your business or farm to be featured on the main home page under the Business and Farm focus pages.
The forum was hacked a few weeks ago and so once that had been sorted, I went through the other week and removed all spam posts and old posts that now had no relevance so that is why the forum is a little sparce.