Glamours will be needlessly annoying...

[kukurumei]

But they have to save&load that extra variable anyways to keep track of what appearance goes with what gear piece, similarly as how it's done with dyes (unless they give new #IDs to account for all the possible combinations, as I mentioned). So the only difference is where it would be saved and from where you would get said data with the query.

Depends how it's coded and then recoded for the glamor system. Doing a straight forward query ID is not an effective means when you program MMOs there's probably a lot of tricks involved to front end that.

They can do something as complex as making another server just for the glamor system (which maybe cheaper then system maintenance every-time it blows up)

There is a lot of ways to re engineer this