50k each is 1million gold for 120 skill. 60k each is 1.2million gold.
Keep in mind tamers also need animal lore scrolls to keep up with taming. Those go for 25k. That's another 500k.
So at 50k taming & 25k lore-- it takes 1.5million gold to use 120 pets. 1.7mil if taming scrolls are bought at 60k.
I'm sure some people may buy one/some for 55-60k out of desperation-- but imo it's a bad price for the buyer and sets a bad precedent.
There is no reason for a tamer to offer more than 50k each. If you do, you're paying too much.