It's a fair point in the sense that .nets are available for many of these, but they were all dropcaught, not free reg'd.  If you go onto any sites like dan.com and search for "coin" + (viable single word).com domains, you won't find any for less than $1,000.

I tried to secure coincrush.com a few months ago, their price was $13,000 (unfortunately)... it's a good name for a range of different projects. 

cointube.com dropped about a month ago and sold instantly at auction for about $8k from memory.