A Geographical Indication does one thing: it reserves a name for cloth made in a particular place, by a particular method. Ilkal was registered in 2007–08, Kancheepuram Silk in 2004–05, Pochampally Ikat in 2004, Kota Doria in 2005, Bagh in 2008 and Bagru in 2011.
What it does not do is promise the cloth is good. A GI-tagged Ilkal can be woven badly. An unregistered Bengal cotton can be superb. The tag tells you where a name may legally be used — nothing about the hand of the weaver who used it.
This matters most where the name is doing the selling. 'Chanderi' on a label is worth money, so 'Chanderi' appears on a great deal of cloth that has never been to Ashoknagar district. The registration is the thing that makes that illegal rather than merely dishonest.
So read a GI as an address, not a review. Then ask the second question, which is the one that actually decides whether the sari is worth it: who wove this, and on what.