Whatever you are buying: If you have some device in mind, check the idle power consumption. Your server is running 24/7/365. If you buy something with a high consumption, that will be hard on your power bill.

10W = 87,6 kWh a year @ 0,25 Cents = 21,90 per year 50W = 438 kWh a year @ 0,25 Cents = 109,50 per year

That really does matter

It’s not that bad if you think about it:

The passengers stepped from the platform onto an access sidewalk 80 centimetres (31 in) wide traveling at 4.2 kilometres per hour (2.6 mph), then onto a faster sidewalk 2 metres (6 ft 7 in) wide moving at 8.5 kilometres per hour (5.3 mph). It could simultaneously accommodate 14,000 people; during the afternoon of Easter Day, it carried 70,000 people, while the busiest tram and bus lines carried little more than 40,000 passengers a day on average

Think about such a system near central train stations. You arrive at the central station by train. You hop on that thing and are transported near to your workplace. That could work better than a bus.