Standard View studios at the resort with arguably the best point chart is probably not a good comparison to cash. Now do it for a Grand Floridian Lake View 1 bedroom Unit and tell me how it works out.
For the same nights at a Grand Floridian Lake View 1 bedroom:
Rack rate: $1602 per night
DVC points: $619 per night
I purchased 2 of my 3 DVC contracts more than a decade ago and, to date, have averaged $12.83 per point across all 3 contracts for all of my stays (including original purchase price). That number continues to decline as the original purchase price gets spread across more years. (Unlike some others, I keep track of what I have spent to date, rather than spread the cost of the original purchase across the life of the contract.)
Until my Maintenance Fees reach a combined average of $12.83 per point, my cost per night will continue to decline each year. After that, they will increase.
Of course, Disney keeps increasing the price of its hotels, nearly always faster than the percent increase in Maintenance Fees. Consequently, I expect my savings to grow as long as Disney continues to increase what it charges for its hotels.
Maintenance Fee increases are governed by Florida law - they can only increase by actual cost.
Disney hotel prices can increase by whatever Disney thinks they can get away with.
Having closely kept track of all of my DVC stays and the corresponding rack rate for the same room, I calculate that I have received a 64.95% room discount to date.
As you note, the Boardwalk Standard View Studios are probably the best value (along with AKV Value Studios).
Where I’ve saved the least are for my Vero Beach stays (which have much lower rack rates than WDW hotels). The worst-case savings there were only 4.3% for a one-bedroom in the summer, practically the same as rack rate!
Of course, Vero Beach is DVC only and it’s difficult to find cash rooms there in the summer, so I didn’t have much choice.