So, a Syme produces, lets say, 10s, per month, where 1s == the amount of s required to feed on Gen (G1) for one month.

If a G1 feeds on (or whatever the verb is) S1, is that Syme (assuming they survive) left with 9s, or do they need to recharge for a month anyway?

Because if the former, you'd think a good marriage would have a family and their Syme. I mean, it seems inefficient to maintain S2 and waste 18s every month.