Well your power consumption is mostly from the quad GPUs and also in Linux the power consumption is silghtly greater than other OS. So taking everything into matter 755 W power consumption is kind of normal and nothing to worry about.

The abilitity to transfer funds without the intervention of a middleman is entertained by Bitcoin. Bitcoin also eliminates the need for a centralized space for transaction. Transcations can take place in a p2p platform very easily.

Most of the people actually do not care about decentralization as long as they cannot see the potentiality of blockchain and cryptocurrencies. World is actually far away from having this decentralized money let alone global one.