Excellent name. It combines three very popular words on the Internet --
free, gambling, and casinos.
Overture shows an 817 count for "free gambling casino."
Google shows 2,260,000 search results without parentheses, and 4,300 with.
Wordtraker gives a score of 58 for "free gambling casino" and a score of
7 for "free gambling casinos," indicating that searches for "free gambling casino" are conducted more frequently, and thus "free gambling casino" would probably derive more type-in traffic.
Not surprisingly, freegamblingcasino.com is set up as a ppc site.
You could do the same.
If you wanted to sell the name in the near future, I would value it between $400 and $600+
If the right buyer comes along, you could have a nice payday.
It is an excellent name with great long-term potential.