I love the fact that MDC moms can advertise in their siggys. I buy from WAHM's anytime I can so I really like to see what everyone is offering. I also feel pretty good about buying from a WAHM who I sorta "know" from MDC.
(hmmm...I really need to get an ad into my siggy...)
Every 2-3 weeks. People easily get used to the same wording and will stop looking/clicking on it. I also only put it on for 3 months, then take it off for a few weeks for the same reason. This time i put it up again quicker due to a specific topic at mdc.lol