Domain SEO Question - if adding any letter affect SEO?

Hey Guys

I am wondering when creating a domain name would it be OK to add any kind of letter in the end just to have the KEYWORDz.com in the URL?

such as: instaid of CasinoLive.com I put CasinoLives.com ?
The main keyword is still present and if using MarketSamurai it would say YES for URL Keyword included in the domain..

Whould it work?
Thanks

Others say it works great. The main problem would be with those who type in your url.

Be careful of trademarks. Other than that it's fine. From an SEO standpoint google is going to look more at your anchor text links to your site to determine which words to use for ranking it.

Have you tried going with a "-" inbetween the words first? Also try .info, .net, .org or .biz....from what I have seen these make very little difference in SEO ranking ability...so you can still snatch them up and use them for domain SEO...