That's not enough. If I purchase something, I expect to rely on being able to keep it. Its value to me could well be much higher than just the purchase price.
Revocation should come with consequential damages together with the cost of recovering them.
If I paid $5 for a movie, I did that because I want the movie more than the $5. If I didn't, I would've kept the $5. You giving me $5 and taking the movie away is just replacing the thing I value more with the thing I value less.
The other issue is that, if I paid $5 for a movie 10 years ago, that's now more than $5 due to inflation. If you give me $5 back, you're short.