Why wasn’t the main currency renamed after Robert’s Rebellion? After all, Robert didn’t seem like a guy who wanted to hear the word “dragons” everyday. Why not just go with “golden stags” and “silver stags”?

rewenzo:

racefortheironthrone:

Because it would be very difficult, time-consuming, and expensive to replace all the dragons in circulation or being hoarded with new “golden stags.” 

Why’d they bother doing it with silver stags?

They didn’t. The silver stag has always been a stag.