Board Thread:Game Discussion/@comment-37667252-20190917104100/@comment-27170954-20190917135717

another reason the rewards are gone because - if you're careful and patient - you can potentially earn a car in the event archive while its upgrades are on sale. This will ultimately cost you less than the original event.

this is also a reason for the 20GC skip ahead.

The rewards in the original events are equivalent to a "special introductory offer." They still want players to focus on new cars - they're probably more lucrative. rewards on old cars distract from that.