@aerion111
 
Keeping money leaves options open and provides a buffer against unexpected hardship.

@aerion111  
Sure you can! Put it in a sac and then put that sac in a bag. ;)

@Lucky Shot  
I think the cake makes more sense; At least people do use cake as decoration, usually during the pre-dessert time, while in your suggestion there’s not much direct benefit to just keeping money unspent.  
Still, though, you’re listing just kinda keeping the money around, perhaps to swim in, as a potential choice.  
The Norwegian version means ‘don’t be greedy’; You can have in sack or bag, but not both. Leave some for the rest of us.

@aerion111
 
I think if we replaced ‘eating cake’ with ‘spending money’ the idiom would seem much more relatable.

@Lucky Shot  

 
You’re right, of course; That is what it should be.  
It’s still kinda dumb:  
The Norwegian version roughly translates to ‘You can’t get in both sack and bag’ (the grammar’s less clumsy pre-translation, of course) - combined with our version of first-come being ‘The first man to the mill gets to mill/grind first’, this seems to indicate they’re rules of conduct from back in the olden days:  
When stuff’s handed out, fill just a sack (if there’s more left, you can come back for more after you’ve emptied the first sack at home and given the rest a chance to get their share), and when going to the mill you do it in the order you arrive (no ‘I’m better than you so you should stand aside’, no ‘but my job’s more urgent’, and certainly no threats of violence; just shut up and wait your turn)  
Practical rules for practical people.
 
The english version?  
It sounds like it’s advice coming from the most spoiled of rich people:  
‘Remember; If you eat the cake, you can’t use it for decoration anymore.’  
Like, seriously, that’s what you feel the need to turn into a saying?  
‘Consider leaving the cake uneaten so you can just kinda keep it around’? That’s what passes for ‘wisdom’ for you lot?

@Eeveeinheat  
Unfortunately simple spellchecks mostly just look for misspellings. So long as you spell the wrong word correctly they won’t mark it. As a result the definitely/defiantly mix-up is as common as the there/their/they’re mix-ups.

@Officer Hot-Pants  
That’s an even worse mistake, considering spell checker is a thing.

There are three reasons why someone could acceptably say “I could care less”.
 
 
1. As sarcasm and/or verbal irony
 

 
2. Because it’s a comparison, but we forget to say so
 

 
3. Because idioms don’t have to make sense word-by-word for the whole saying to mean something
 

@Mellow91  
(\

@ThisGuyHasNoName  
Exactly

@Mellow91
 
Still no less annoying when it comes up.

@Officer Hot-Pants  
You, sir, just made my evening in just a few minutes.  
Thank you! /)

Rarity would know better than that. It’s “couldn’t”.
 
@Mellow91  
This one is, for me, right up there with people who “defiantly” do things. “I defiantly prefer the blue. No question.” Really? You openly prefer the blue in the face of raging anti-blue oppression?

@ThisGuyHasNoName  
This seems to be a common grammatical error for some people

Uh, no…. the proper way to say it is, “couldn’t care less.”

Couldn’t* care less.

at least she cares a little.