@germanskater: sorry that I just say what I think, nothing to do with you
Okay, let me put it another way: if you don't want to RP, you don't. If you got mines on your kingdom's island, you won't leave it except to buy stuff and to level. I think everything will focus on the kingdom islands rather than main, except for leveling and wars maybe, which won't be improved by mines in any way - that is, it won't prevent them from just being plain PK if any participant doesn't stick to the rules. So maybe it won't decrease RP, but it certainly won't increase it, either - imho.