You can get all that* for $375 from Chase, plus PC membership.
*Except for restricted seating access, which ends up unrestricted and fully populated by Kettles from front to back. Some benefit!
You forget non-elite now have to pay for the restricted seating as of today.
You are right about sliver is worth much less than $375 but definitely don't want to fly without some sort of status as lowly as it may be.