MagicManICT wrote:This is the "wall of diminishing returns."
C) Keep pushing boundaries and use every game mechanic possible to improve things for that small percentage margin. In the case of your water, find a well of decent quality, claim and wall it, and then use the hearth magic ability to keep raising quality as you build up XP. Water isn't a hard cap, it just slows things down, so keep pushing in other ways, too. Make some friends with the factions to see what they're willing to trade.
Thanks for advices! I have a well q15. It is worth to upgrade? How much the quality will rise after the magic?