This is a role-play Flaw.

Char has taken a VOW of Poverty, the CHAR normally has little need for cash,” maximum of 10gp”. The CHAR will handle money, and when they complete an adventure with treasure, they will use the treasure is to renew/replace adventuring items and equipment.

On completion of replacing/upgrading equipment, the CHAR will “donate all leftover treasure to a Church or Charity of their choice”, that is most suitable to their beliefs.

Because of this flaw, your gods have given an additional Attunement slot.