Tugs are Disappearing?

[TheEye]

After a "Tug Purchase" And then taken home and put in a TC Protected Building. Their Boats are "Disappearing". I f they were payed for. Why would you allow them to be "Disposable"? Is their a way/setting to protect them from decay and being removed? Why BUY something if you have to keep buying it? And is Disappears?

                                                                                                       Thanks                   Dave