Can MAC address filter circumvent WEP cracking

We all know that WEP can be cracked in a few minutes.  There is an interesting question of whether MAC address filter can  increase the difficulty of WEP cracking.

The answer is No. MAC address filters  are useless because  MAC addresses are broadcast over air. When a legitimate client is connected to a WEP AP,  a hacker can use hacking tools to discover the MAC address. He then clones the MAC address to his devices and then proceed to crack the WEP key.   To reinforce my saying, I have taken a photo from a Linux machine running spoonweb.  In the photo below, the MAC address of a connecting client is shown.