Which is more profitable – an MMO with a monthly subscription or a free-to-play game?

I used bots to acquire a mount pet, a decent flying mount, and some gold gear.

How long did it take, and what was the result? I'm referring to the amount of yuan, even if it's just an approximate figure, as it's hard for me to judge based on this sentence, since mounts and gear vary, and prices fluctuate constantly depending on the gold exchange rate.