Premium domain names continue to be an outstanding investment. This is nothing new to domain investors, and now the numbers confirm what many of us have known for several years.

Looking at DNJournal's List of Top 100 Reported Sales this year (2007) and last year (2006), the top 100 median sales price has increased from $124,000 in 2006 to $197,500 in 2007.

That's an upsurge of 59.27%, which is a pretty good representation of this year's bull market in premium domains.

Owners of LLL (three letter) domains have seen the values of their domains increase by at least this percentage over the course of 2007, and the same applies to many top generic domains whose sales either remained private or simply did not meet the $100,000 threshold to be included in this year's top 100 list.

Is there a drawback to this continuing boom?