Respectfully, I'm not sure that makes sense.
Let's look at cost first. If you price an unlimited package at a reasonable amount over the 10 print package - let's say at $200 versus the $170 we saw earlier in the thread - there is a huge value add for the consumer, and a huge incentive to pay the extra money because you're getting a lot of images. Even if you priced it at $30/night, that's $210 for a seven-night cruise, and I think it's still good value versus the 10 print package.
As for the staff, whether people have a package or no, their job doesn't change. They're still asked to go around, take photos, do whatever it is they've always done. Their workload won't increase or decrease because people have an unlimited package. So going back to my scenario, you're not paying staff more than before, but you can increase the revenue per stateroom. I'm not sure how that would be a net negative for the cruise line.