Rake in
Definition 1 of 2
Pro Tip 1/3Impressively Large
Used to describe earning money easily or in great amounts, often impressing others. 
The new app was raking in millions within months.
Pro Tip 2/3Success Hint
Implies that the person or business is very successful. 
His investments have been raking in substantial returns.
Pro Tip 3/3Not Physical Work
No physical raking involved; it's a metaphorical way to illustrate income. 
The concert was a hit, raking in thousands through ticket sales.