Would be nice, if it were such an easy thing. I have one ship and crew, everything is part of a storyline i play. It would look odd to change something without any reason. I do not fly a ship cause of its look, i fly a ship. And i have no money to buy a new one inRP. So what?
And then some angel came and gave me a fantastic new one instead of an old, often repaired and second hand bought? Never! Then a story ends, no drama but for me it would be a little bit sad. That is all.