If any of you use Trainz, an excellent railway simulator, you will know that as their community developed, talented members created locomotives, rolling stock, scenery etc. which are downloadable. The majority of it is free, but some of the creators charge for their work. Good for them, it takes many hours to create a complex item. At the end of the day, the choice is yours, accept what you are given with good grace, or pay.
I hope that this community develops in popularity, and creative folks do add to the ships available. It's early days yet though, let's keep positive.