What rekkles said is not correct, though. There are 3-4 traditional NA LCS orgs that could outbid Fnatic as said by Fnatic founder on twitter, really, and those were the major ones. NA talent got generally paid more than EU talent of similar level because the talent is rarer in NA, but the bottom of players in NA LCS were paid basically Riot minimum salary + housing on lesser orgs like NME
The thing is that now in NA, like what happened in China, some new orgs backed by some super rich investors, are entering the LCS scene and are throwing a lot of money to take a shortcut and go immediately to the top, and these investors are American or have strong interest in American's market
Not even traditional NA LCS orgs can compete with those teams like NRG and Immortals, either