I had a cat that loved ham. maybe they like the salt
I think that's what it is. I read that you should feed them something salty now and then to encourage them to drink water. I also read that they need oil to help eliminate hair balls. Not sure how true that is.
I do know that we only gave our cat 9 lives once and never ever again. Poor thing. I had bought a four pack and the first time I opened a can of it, the oil just sloshed around so bad! I ended up putting the cans in the fridge to help solidify the oil so I could scrape it out and throw it away and then mix the cat food with their normal brand (fancy feast).
At the time we only had the one cat but he had to make so many trips to the litter box in such a short time. It got to the point where he would meow loudly then dash to the litter box, finally he gave up and laid down right next to his litter box to make the trip shorter. It was funny initially, but as time went on I truly felt sorry for him and told him I'd never buy that garbage for him again.