What nab would use 400+ coins just for a pet?
I quit that kind of craziness back when I used ~300 coins and didn't get Bride Befana.
Only difference is that, back then, Befana was one of the best mage pets around.
You can buy the pet fused for quite cheap, like 20~30m.
4G5 you can buy for 200m, which you'd easily make by selling some MS, a LOT LESS than how much it takes to buy 400+ coins.