There are 10 Awkward Art Objects in here. Do the adventurers think they've got it made once they beat the last monster and gather the loot? Maybe not, if that loot includes things like rugs, tapestries, paintings, and other large, fragile, or otherwise less than portable objects.
Then there are 10 Perplexing Potions. Are your healing potions all alike? And easily distinguished from the strength potions? Throw a couple of these into the mix and baffle the players who think they know it all!
Next we come to 10 Hopeful Hirelings. The party is looking to hire some muscle? Or at least someone to lug those awkward art objects? These are the first ten people who show up in response to the announcement. Of course, the players don't have to know that #4 will stab them in the back any time he thinks it's a good idea.
After that, there are 10 Perilous Places. Because "some cave somewhere" isn't nearly as evocative as the Echoing Treasury of the Phantasm, and the Church of the Wraiths, which is near the Demonic Badlands, is just begging to have an adventure designed around it.