Guild levels go up to lvl 150? Idek for sure but our guild now is 122. Thats already 37 levels above the character cap. Meaning 74 skill points more to blow on GuildSkills.
Higher levelled guilds invest on everything equally. Though some skills like HP/MP Regen (which gives a very low passive) are ignored to save on points. ALso guidls only invest on +Guild Member skills when they really get no more slots, so they expand.
Other better passives, which are Tier 2 and Tier 3 in your guild skill windows are usually maxed out by the time you reach maybe level 60--75 as a guild? Somewhere around there, Im lazy to compute. But theres no "builds" for guilds if youre a high levelled guild anymore, simply put. You can afford to place points in everything already.
Unless Sedy expands on the skill passives again =) Then there would be building.