Why are you telling me to 'engage brain then type'? I wasn't aiming my post at yours , if I was I would have quoted you .
Who says everyone will use a revel mercedes dtm kit! Some may want to use a kit where the weight weighs 30g in which case weight needs to be added to the roofs of the cars IMO it should be a 10-15g penalty for having a different body if it is under weight , if you really want to run it you won't mind
And with regards to replacing them with alloy wheels , surely this again removes the standard part , if someone else puts alloys on there car because they broke them , quite frankly I am going to put alloy/mag wheels on mine too , I'm sure I wouldn't be alone .