It depends on how long the save has been around for. For example, Seeds of Chaos put out an update a few months back that required you to start over and i'm not going to redo 30h of gameplay just to see 30min of new content, i'll just wait until it's a few hours at least.
I would love to go to cinemas more often but i'm not paying these increasingly exorbitant amounts when the quality of the theater and/or movie is not worth it
The most consistent game i've ever seen so far in terms of updates is Corruption of Champions 2 and Trials in Tainted Space, both of whom update monthly without fail.