Is swz.salary.com/ accurate?

I did some research on how much RN's make in DC/MD area. I researched how much an ER RN with a BSN makes the first year and then again after 5 years of experience. i got the same answer. how is that possible? I did a couple other searches to see if i got the same amount with 0 yrs of experience and 5 yrs of experience. ei., ICU, NP's etc... all made the same amount with in that 5 year window. is this accurate? has anyone else looked up information on swz.salary.com/salarywizard/ and saw some conflicting information?