I have just started earning on the signature campaign,i waited for some time for that so these are really precious for me so i would only collect them in my wallet and see them grow and i would advice you to do the same thing.Because spending small amount anywhere is not going to give much profit so better saving them first.
Not like you, the OP is a Full member and compare with a Member like you is a huge different between. You have just started earning from signature campaign, so yes, keep all your earning in your wallet is a good choice. But 0.01 bitcoin per week is not that small anymore, the OP should start doing something more with it to grow.
There isn't that much of a difference, to be honest, it compounds more when you're earning over time and that additional 0.1 mBTC per post can mean a fair amount of a difference, but there isn't much of a change with pay-per-post campaigns for a week vs week basis. As I said over time it compounds more and makes it more noticeable, but it isn't much of a change for most people.
I'm about to be a hero member and I'm waiting to see the next 0.1 mBTC added to each post, but I'll be honest I've made so much money from signature campaigns compared to the amount of work I've done. I think signature campaigns overpay, but I'm not complaining.