Not sure what Honda dealers use to cut the key, but the micrometer key machines that locksmiths use are very expensive - probably in the $1 to $2 thousand dollar range. These can be used to cut virtually any key once he knows the depths and spacing. Schlage and other manufacturer's (probably Honda, too) sell a nibbler - you insert a key blank, dial the depth with the machine set on position 1, and squeeze the handles (it looks like a pair of pliers on steroids). Advance to position 2, dial the depth, etc...
Years ago, the nibbler sold for $265 for Schlage (and I passed up buying it and have rued that day). Now the price is much much more and you have to have a locksmith's card to buy it*.
So, all this is to say that I would expect dealers to simply buy a copying key machine (new from $400 to $800 for a manual one) because they can cut (copy) virtually any key. The nibbler style can only cut keys that use the machines position and depth spacing.
*Grin, you can probably buy it on line for half as much.