It's a waste of money.

Meaning

It's not worth the money spent.

Examples

• John: I bought this new gadget, but it doesn't work properly.
• Alice: Oh no! That's too bad. <b>It's a waste of money</b> then.
• John: I know, I should have read the reviews first.
• Alice: Next time, remember to check reviews! It really is <b>a waste of money</b> buying things without checking them first.