As stated in the title - no rebuying previously bought parts, because it would allow for more testing of cars' performance
For example - I would like to try going 3/3/3. After driving on that setup I'm not sure about it -> I change to 2/3/3. It's worse. To go back to 3/3/3 I need to rebuy these parts again and lose money.
For example - I would like to try going 3/3/3. After driving on that setup I'm not sure about it -> I change to 2/3/3. It's worse. To go back to 3/3/3 I need to rebuy these parts again and lose money.