Yeah this change makes no sense and is very disheartening. I myself just spent the 200k gold on the Flawless Amethyst Baubleworm because 10k is an absurd amount given the rate of acquisition on pet charms. Hope this gets addressed or talked about in some capacity.
I think the total amount on a fresh character needed to buy all available pets with pet charms is around 25,000 and is only going to increase. This reduction makes that goal a fantasy.