Price of domain totally depends on how you research in regards for the domain traffic, market values, new domains renewal, importance of domain to a person or an organisation and the budget.
All the things are equally proportional to each other. In regards for your domain casinoshowcase.com , following research have been made by me :
Live Since : 1999
Owner Name :Betscape
Email :
webmstr@casinoshowcase.com
I could not find any live website and could also find you have hosting with bluehost so could easily define with no traffic.
I could also see that your domain was registered on June 04, 2003, renewed on June 09, 2015, and will be expiring on June 04, 2016. So if I have to purchase the domain, and I am preferring to Web Hosting services, as I could also find that your website was attracting traffic most in the year around 2000, would refer the domain as new and would suggest you to put the price of $5 to $20.
If you have any link to casino or pub supporter or owner, you can get the price between $10 to $50.
If you are looking for more best price, you have to step towards in the casino market revenues, and found those who have their transactions of domains for $100 per month, and can provide you the same.