That is a valid concern, if perhaps a fusion plant requires the outside be coated in platinum or something. It would have to be both expensive and difficult to

That is a valid concern, if perhaps a fusion plant requires the outside be coated in platinum or something. It would have to be both expensive and difficult to manufacture/obtain. It is essentially where we are today with ITER, which is to say if ITER generated net power it would still be a hard pill to swallow if it costs $100B per power plant. Fortunately, many of the significant costs the plague fission plants (like the legal expense of dealing with all the lawsuits, the cost of unlimited insurance, Etc.) would likely not apply to fusion plants.