If you think you need to up your prices, then you should do it now...otherwise you're just constantly changing your prices which confuses buyers. Just find a number and stick to it. 6 months down the road if you're selling faster than you're making items, up them again. Or if you're not selling anything, take another look at your numbers. But don't keep changing them every week, it looks unprofessional to anyone who checks out your shop more than once!