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Does your machine have a Wi-Fi interface? If so, then en0 is probably a Wi-Fi interface and, as Jaap notes, They're Different, in that promiscuous mode doesn't work the way it does on Ethernet interfaces.
If you don't have a Wi-Fi interface, and en0 is an Ethernet interface, then are you on a switched network? If so, then, even if the adapter and the OS driver for the adapter support promiscuous mode, you might still not be able to capture all traffic, because the switch won't send all traffic to your Ethernet, by default. See the page for Ethernet capture setup in the Wireshark Wiki for information on capturing on switched Ethernets.
