BIEBER'S A GOOD INVESTMENT

Some people buy stocks, Macklemore buys Justin Bieber -- nude with a pancake, maple syrup ... and a boner.

Mack was cruising The Grove (so UN-thrifty) in L.A. when we asked about his now-infamous purchase of a very unique oil painting of Bieber. Here's the thing, he actually thinks he's gonna make money off this thing!

Check out the clip for his financial analysis of Bieber's pancake boner ... and the REAL reason he bought it in the first place. Hint: It was NOT to make money.

See also

The Game -- 'Mad' Love for Prince ... $65,000 Worth!!

Rob Kardashian -- Blac Chyna's My $35k Diamond Girl

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