becuase this one cant be used in BCNM 30s so its soley for the fact that the lv 30 one can. also in any situation where the level cap is 30, like Promys.
they are cheap to get via gate guards if you are bastokan though.
yes they work... the under your own nations control means that if your from windurst and the place that your in is under windurst control then you get the enhancement it doesnt go for just bastok
21k-ish on phoenix. There are also Republic cuisses which i have, basicly +1 versions of these. Stats (i think) Def: 19 Agi +2 Areas in Nation: Attack +7 Ranged Attack +7. Those go for about 80k