Silvers
The problem with Silver is that with some of the promotions last fall anyone can be a silver with a RT to Europe or a couple coast to coast flights at EL Cheapo fares.
The real value is typically the folks who fly regularily enough to make a difference and spend $$$$.
One J class from USA to Europe/Africa can run $6000-$10000 USD
That would be around 50-60 el cheapo coast to coast hops for a single ticket.
I believe there should be a 100K Miles level and add even more benefits.... Or maybe 150K. (I would have given NWA more miles last year if there was a real benefit at a higher level, but, stopping NWA at around 125K Base miles I spread the $$$ and got Gold on two other carriers.
If they had a 150K level and NWA had "REAL" benefits I would have spent a bunch more $$$.
Now with Roach Coach Choice I am pulling all travel (Except award redemption) until they fix the "Screw the Elites" program.