Tips for an increased multiplier.

Also, be aware that some items don't list a multiplier within the game. i.e. when the Cow Tongues were in the store the info bubble didn't list any multiplier. Another example: the wailing wall. When they were craftable during an event the screen never said "hey, this has a multiplier!" but people figured it out (and then went hog wild crafting them).

As such, it doesn't hurt to keep tabs on this forum or your favorite Tapped Out blog or wiki pages. If a new item has an unexpected multiplier then they'll likely be some mention of it on those places.