The way to tell whether you should surge or fight is pretty simple: if you can win 3 fights for every 2 losses, and you surrender those losses, it is the same as if you win 5 fights (on average). This is assuming 40 points per surge, and 20 points per fight.
How about if we instead have a net point requirement for members? If we have an lp requirement of 30 per day right now, that would mean that they would win about 600 points for us on "fight," and 1200 on "surge." So, if we have a net point requirement of, say, 500/day (3500/week), and tally it and the end of the week, that would ensure that we are getting quality members who aren't just active. It would also ensure that members are using good defense decks, because those defensive losses will count against them.
This would be hard to keep track of, so it would be best for the officers to keep track of lp--if someone isn't getting 210 lp/week, then we can look closer at their performance and calculate their net points. You could get 500 net points in as little as 12 surges, so once we double check that should give us a better idea of how they're doing.