Is a sub worth it?

So I have Yamaha HS50 speakers which are pretty small but decent, but was wondering if it's worth getting the sub speaker to compliment the set. Obviously Hip Hop is bass heavy so would think it's worth it. But is it? The Yamaha sub is not cheap so would need to see some sort of ROI. Have any of you guys got a sub? I thought about just getting bigger monitors but I love the Yamahas and would be hard to give up.
 
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