In real life, solar panels don't cost more than nuclear reactors - nor do they require the output of one to create.
And in Real Life, people don't design devices that cost more to make than they return. In Real Life, they perform a cost-benefit analysis before the design is implemented.
In real life, there's no such thing as "UU-Matter" that can create gems, ores, brightly coloured blocks etc. Might as well put that out there.