video. You can buy the digital collectable and then you own that specific copy of it. You can hang on to it and will it to your kids. You can sell it to someone else. Think of it as the one and only (if they only produce/sell one copy) officially licensed copy of that specific photo or video. A lot of times, however, they might produce multiple copies of the digital collectable. You might end up with #38 of 50. I'd imagine that #38 is probably slightly less valuable than #1 of 50.
Think about owning the exclusive digital rights to the Miracle Bowl win. Or one of Detmer's TD passes against Miami. Or the digital collectible of one of Taysom's hurdles over Texas or Mangum's Hail Mary against Nebraska. Iconic moments like that you would own forever and potentially be able to sell or just hang on to and give to your kids.