Quite frankly I would prefer if the sim upgraded my boat (as if it came as a directive from Bdu) based on performance parameters especially in the campaign mode. I do not understand "paying" for it as it to me is an immersion or historical skew as no one had the option to "buy" into a new boat with selectable "options" like a car. Seems silly or arcade like. But hey, that is my opinion. Still the best sim out there! Renown actually refers to earned recognition (points) for job well done not "money" to buy stuff.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html