Akos, when I joined FAA eight years ago, it was possible to sell regularly based on the internal search. Since then, two things have happened.
First, there has been an explosion in the number of artists and artwork. Even if the search were fair (unweighted) it would still be unlikely to get your work noticed to any significant degree, given the numbers. The second thing is that the search was restructured to take several factors into account, with the most weight being given to prior sales. The exact nature of the weighting is a closely held secret, but in short, unless you sell regularly and often, your images probably won't make it into the first few pages of the search results in most categories.
That's why it's IMPERATIVE to develop an online and offline marketing strategy. You have to send the buyers to see your work, just like in the 'real' world. Don't count on buyers to magically find you here.