I think multicaches are exciting! Makes it more like a treasure hunt instead of "here it is, stop by some time!"
I'd like to do a statewide or nationwide one (although citywide would be more realistic) with not just coordinates at each waypoint, but clues that you'll need later. Then maybe solve a riddle or puzzle to get to the cache...
I don't have very much exprience placing caches, but I think going on an adventure and being entertained is more of a concern than how many people will attempt it. I don't expect the log to be full, and I don't judge the success of the cache by the number of people logged in but by the responses of the people who do
I dunno just my thoughts on the matter