Prices are generated at runtime, they may be very high sometimes but still not requiring more than 1m for all 44 quests, out of which only about 300k is usually spent
It opens GE and withdraws money from bank, if it gets stuck on the GE interface means you have a pending offer
There's more than enough time, all auths last 24 hours
There's a bug fix currently pending approval for a few quests including Tree Gnome Village