If thats the case I think this might be bad. Players, or alliances with the location of a wealthy matian could just blast away entire savings. True it would cost plenty of md (ammo wise) but if the homestead is paying well they could make good profit or at least could break even. I forsee alot of bad blood and frustration if this was the case.
Setts on the other hand have no real value at this time other than bragging rights really, so I think this idea might work in their case.
However do we think there will be a shortage of things to shoot at? Perhpas since we are in the future on mars we only get 1 shot per day, because if that shot fails, the target can recalibrate their sheild defence making our weapons ueless until the next cycle... or something

I love sci fi...built in excuse for everything.