You make a great point but this time the situation might be different.
When BLT opened, it was the first Monorail Resort with a DVC. That’s significantly different than AKV or SSR, which require bus transportation everywhere. (Disney Springs is not a theme park.

)
Disney has been advertising the Riviera as a premium DVC with access to two theme parks via the Skyliner. The three other Skyliner hotels (AOA, POP, and CBR) have seen their rack rates increase by 20% since the Skyliner opened. Indeed, CBR went from the least expensive to the most expensive Moderate Resort.
Disney really degrades how it has positioned the Riviera (and the Skyliner) if VGF2 is sold for a premium over RIV.
I’m sure Disney will raise the price of VGF2 if its sales outpace RIV, but I am beginning to suspect they might want to price them similarly to start.