This rather-straightforward practice got noticed by 37signals, which they termed "refreshing."
If you follow that link and read the comments, you'll see that not all designers felt the same way:
While it’s admirable that a prospective client should have a general idea of what a project will cost them, that doesn’t mean you should advertise your prices like Walmart.
The comments are worth a read. Tyson Caly of Design Vineyard does a good job of explaining his point of view. For one thing, it works.
What do you think a winery Web site should cost?