The TofOffers flow is just a sample application used across various learning modules. It does not implement all functionality. In this specific case, the Clear Interaction Results it is not implemented properly, as you do not need it in any of the exercises.
Thanks for the reply. It explains the behaviour I experienced.
However, I would not agree that this functionality is not needed in the exercise system. If you make a mistake, or do not follow the interaction response instructions to the letter and you want to repeat the exercise in order to observe the prescribed results in VBD, you cannot.
In this case I would recommend you revert to an earlier snapshot and reimport the EnvironmentSetup file. If you do not have a base snapshot, the best you can do is to revert the exercise system (download again).
Overall, I do understand your point and I will look into this to see if we can improve it, since I do agree it would be useful.