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Simply stated- what is the most cost-efficient way to earn money from mining Bitcoin? I've been a HODL'er since '14 but I recently wanted to deep-dive into mining for fun and was surprised to find how easy it was to do with a Raspberry Pi, slushpool account and a little bit of help from StackExchange:Bitcoin. My question now is- do I build a Raspberry Pi "bucketwheel" equipped with USB-miner sticks like the crate displayed below, purchase an Antminer S9 or go to the cloud? I'd appreciate any guidance or considerations for generating >= $100 month- again this is just for fun in experiment; I'm not looking to become the Hunt Brothers of Bitcoin ;)

Thank you- that’s exactly why I said “cost-efficient” I should’ve used asterisks to emphasize. I might try to do all three for fun. I appreciate the recommendations. – alexanderjsingleton – 2017-10-20T14:30:55.857
@alexanderjsingleton I'd suggest NiceHash. I've tried Hashnest and ViaBTC, While I'm satisfied with Hashnest, don't use ViaBTC. – MCCCS – 2017-10-20T14:37:46.663