This is really problematic to answer. It depends entirely on how much risk you personally feel is acceptable. Bitcoins are pretty hot right now. I mean even moreso than usual. They're about to break $30; it's almost getting out of control. They've increased by 100% in like 60 days -- that's fucking outrageous. Anyone who looks at that is going to see possible bubble, but also a possible way of making incredible profits in a short time.If you are not buying hundreds or thousands of dollars of bitcoins on a very regular basis, I personally feel that you are safe. If you are a vendor who is cashing out, that's different. You don't want to use a single service to cash out thousands of dollars even infrequently. That's just blatantly obvious, and even a child could write an automated program to flag such accounts for further investigation.Basically whether it's "safe" or not depends entirely on how much business you're doing. What you're talking about means that they CAN find you, rather easily in fact, if they see a reason to. So essentially it comes down to whether or not they have a reason to. Make a large purchase in one lump sum and you look like somebody investing. Make a small purchase regularly, and you look like somebody who's not investing, but who's using them. There still aren't that many things to use them for -- so you look a little more suspicious, but still not all that worth targeting in my mind. Buy large amounts at regular intervals, and you start looking like you're worth targeting.Bottom line: you should be fine if you consider slightly increased risk worth the convenience. As a disclaimer, this is all in my head. I have very little actual evidence to back me up here, so take my advice for what it's worth. The fact is that if you do this, they can find you with ease. The question is whether or not they give a fuck about you personally.