I have had the pleasure of enjoying Heady 8 different times from various batches and freshness levels... Since they don't date the cans, it really is a gamble on how old the beer is (although you would expect fresh). Some of those cans were easily some of the best DIPA I have had... My last one I legit drain poured half of it because me and my girlfriend just found it "meh" and wanted to move onto other, better beers and not waste the calories... I assume it was quite old based on how different it tasted.
I definitely think that's a factor for hoppy beers. The scarcity ensures that it's drunk fresh, bursting with flavor.