I think US, while it has 110 V, has a higher current so it is not really much less dangerous than 220-240 V.
Anyways, I cannot really believe USA people did not buy Amigas because of the price. Even the Amiga 1000 in 1985 costed 1295 dollars (granted, that was the 256 KB RAM version, but I think even with 1 MB RAM it would have still costed much less than PC AT).
IBM PC AT, on the other hand, costed around 6000 dollars. Yes, 6000 dollars.
And Amiga is not a gaming console. It was far more powerful than most super expensive "business" computers and its GUI operating system could have advanced productivity applications by a decade. Were the business people at the time so insane to shell out 5000 more dollars for a shittier computer because they thought multimedia capability made a computer "toy like"?
Sure, it lacked a "real" text mode. Which is irrelevant as the CGA/monochrome green screen monitors of the IBM PCs made reading text literally painful. Amiga was capable of high resolution modes and well readable text.
At that time, Amiga was even superior in raw power. Even the 7.09 Mhz 68k was faster than the 6 Mhz 286 in the super-expensive AT and definitely faster than the crippled 4.77 Mhz 8088.