In case anyone was scrolling by and is interested the quote is a bit misleading out of context, Marx isn’t saying we should do this, he is more saying that capitalism requires “us” to do this, while telling us if we just stop eating avocado toast we too could become part of the billionaire class. While of course they themselves would never live without these supposed needless things.

Read it in context here Need, Production and Division of Labor, this link is directly to the section the quote is from but in my opinion the formatting isn't as good.

Joyless money-hoarding is why I'm currently able to joylessly pay rent during this terrifying bout of unemployment

Old time comic W. C. Fields was once asked how to become successful.

He said a man should castrate himself, burn out his taste buds, make himself as blind and deaf as possible, and then the only thing he could enjoy was money.

I guess the plethora of balls and fencing matches I was planning to attend are out now.

saving it for what and for how long? at what point does saving become hoarding?

I don't think the original caption is what he was getting at.

I think the point is, the more you can find joy inside, the less you need to seek it outside.