I will repeat to say that receiving all your coins to just one address is bad for your privacy. Why is it bad? Well, if you send some amount of your coins (doesn't matter how much) to someone from your address, this someone can see all amount of your coins "on your address". Depending on how much coins you stashed over time, this might not be something you'd want someone else to know.
You can use a new address each time you want to receive coins for it, or you can use only one to avoid confusion.
Funny how you neglect the privacy issue I described above.
Do you change your address every week to receive payment for the Signature Campaign, or do you just advise others to do so? If this is not the case, then why don't you care about privacy issues when you receive weekly payments to the same address?