Well, I am, and will always be opposed to player made clans.
It would hurt me if I were to see some troll clan named xXx_PusyyDestroyers_xXx walking around the town
So yeah, proceed with preset clans, many people prefer that.
@Teasky2 Cost will not be lowered. Price is fine. 5k ryos per one person (in total team of 3 persons - 3 × 5 = 15) So 15 k per team is not that much but it will prevent level 15-25 joining.