True, although they also have a clock ticking down warning you that your tickets will go back into the general pool if you don't complete the entry form and confirm the purchase in time, making it difficult to review the small print, not that it would have stopped my from buying them.
If you don't read the fine print before you pay for something don't be surprised by what it says!
Also I was able to look up the refund policy for the tickets before purchasing them (I was curious on how much would be refunded, and how), so if you were really concerned about $5-10 the "fine print" was out there before you purchased. It was (and still is) laid out here: http://washington.nationals.mlb.com/was/ticketing/postseason.jsp
"Handling fee is non-refundable" for STH, "All other fees are non-refundable" for single-game ticket purchasers.
Not justifying the policy but it WAS out there and, at least for people like me who were concerned about the refund policy, they were upfront. They were also upfront about when tickets would be refunded, in their own vague way.