No you don't. Commercial use means it makes economical sense. When you have to spend more on maintainance (and recycling/dumping contaminated wall material amd somehow get the fuel) then you never can hope to make any profit.
replyA running ITER with positive energy output for 20 minutes just proofs that the concept can actually work. From there to commercial use would still be a long way, if it ever can compete at all, except in niches, like deep space.
(I rather would bet on the Stelleratar design)
I'm not saying ITER would be a commercial machine, I'm saying the Tokamak design would be viable.
replyStellarators are interesting, but have been studied much less in comparison.