I imagine that the cost of having one output vs the three outputs that exist on the VBS1 wouldn't be that much less. You still have the component chassis and all the same technology employed, so I wouldn't think that the savings would be that much at all. So, don't think of it as wasting money if you're only using one of the outputs. If you spent less money and didn't get something nearly as good, then I'd consider that a waste. So, if you say that you want "the best possible performance path" then the VBS1 is the way to go whether you're powering one Bel Canto front-end component or as many as three.
The VBS1 is really a step up across the board. The noise floor is already very low with the LNS1, but it's even lower with the VBS1. The VBS1 provides a more relaxed and natural sounding presentation that allows you to get immersed into the music in a better way. Subtle details and delicacy is better with overall better refinement in a totally non-analytical manner. Go to the review section on our site and see the reviews of the VBS1. I think the reviewers got it right when they talk about the difference the VBS1 makes. I know I wouldn't want to be without it in my system and I already use good line conditioning. The VBS1 still takes performance further.