How do people feel about how much of an advantage a switch hitter has over a righty?

I love switch hitters. I hate having a line-up full of RH hitters. I always try to incorporate some LH hitters, or preferably switch hitters.

Huge. The 65 across the board hitter with elite power (95+) is a good player as a right handed hitter, but if he's a switch hitter, he is a great player. This is 1990s baseball we're playing and back then switch hitting was huge.

The average difference between VsR and VsL among pitchers is 9.6 points.
An RHB will have that against him about 2/3 of the time, an LHB 1/3, and a switch hitter almost never.
My models would suggest that getting that advantage 2/3 more than an RHB would be worth about 0.3 RC/27, or about 6-8 runs per season. Relevant, but not huge.

EDIT: This is the correct answer to the question, "if a RHB and a switch both have the same VsR and VsL, what's the switch's advantage?" Obviously the average RHB has a greater VsL - VsR difference than the average switch, so there's an additional advantage to be gained for the switch there.