Wreck entities are for differentiating between a damaged entity and one so damaged it can't be repaired. Just so happens that there isn't really a way to 'wreck' an entity nowadays except for repeated sunning.
Nope, Kay, you can sun ship for unlimited number of times and you will never get a wreck. Wrecks where made by recycling before r. code was rewritten, right now there is absolutely no way to make a wreck.
As it is a percentage based system Kathlen, technically, depending on how the system wrks at values of one or lower, it could technically be flown in forever, and it would never get down to 0 since taking 50% of .2 still gives you .1 - but that is entirely depending on if it round up or down. Up, you never lose. Down, you gonna die.