Fred, first of all thank you for your comments and explanation. I started playing SS from the very beginning with SS2006 and I have enjoyed playing them all up to and including SSE. Of course I had my complaints when I compared new games against the old one, for instance SSE vs SS2008 a some nice features found in 2008 where not in SSE although SSE was an improvement in many other areas.
However, you say that the game is already 3.5 year old, and I'm surprised to experience that quite a lot of persons I meet that play simulation games ( even in The Netherlands) do not know about the existense of the SS range of games. A game is profitable if it sells. Maybe VStep should look at the way they market their simulation game products.
And with regard to new add-ons. Development of add-ons can be profitable if done correctly. It is normal for frequent players to ask for new features. If you play frequently you are looking for new challenges. In general they will pay for these. But again, it is a matter of marketing. Only high volumes will bring you the profit. And if VStep do not have the resources they should probably think about licensing other parties to develop professional add-ons for their games. Makes the gamers happy and VSteps earns license fees.
I will continue to enjoy SS with all the bugs in it. It is a wonderful game.