$30,000 for a mold is not uncommon. In fact, we have many molded items in our equipment (medical laboratory test equipment) with molds that cost into the $40K+ range. I believe cost is partly based on the required precision of the molded part.
CNC is a completely different process, and can be a more cost effective solution, if only producing smaller volumes of parts. Once you hit a certain threshold, though, it's cheaper to get the part molded, if possible.