Until they make all their source code available, I would say yes. Who can create a Ripple node other than them right now? Developing "gateways" for Ripple is like developing Facebook apps; they can shut you down at any moment.
Usually I buy on an scheduled basis and don't care much about the price. If the price is going down fast, then I will wait for some time until it stabilizes.
In general, I think that minor price differences will not matter in the long term.