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The battery pack is going to have a pretty light load on it because the charging plug can only handle so much, most people have their electric car charging off a 20 or 30 amp 220v breaker, 6kw chargers are becoming more common and that's under 30 amps and the drive motor can draw 100's of amps, the battery management system also protects the battery pack from over discharge and because the vehicle is not moving then the charge and discharge can be programmed to be pretty kind to the battery pack.
If it really does provide $5 per day of income by leveling off peek loads (the most expensive grid electricity) then that's $150 per month and you can lease a Nissan Leaf for $200 per month, even if you have to pay the extra $400 out of pocket to have this feature added to an EV as a dealer option and lets say worse case is $1000 extra for a charging station that can handle two way connections you are still getting to drive an EV for less per year then a lot of people pay just in gasoline.
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