Just doing some quick math, if we take the low-end for your time (4 hours), and the low-end for your gold drops (7 gold per mob) [basically assuming your fastest possible run with the numbers you gave], that basically means that for you to make 450 gold you would have killed one low-tier goblin every 3.75 minutes, for a total of 65 dead goblins in 4 hours. Even though I've used overly conservative numbers that would still be extremely slow considering it takes like 10 seconds to kill a trapper, sometimes 2-3 at the same time, and it doesn't take 3~ minutes to find another one.
My experience has been pretty different, I've made 2k from farming goblins so far and can take down bosses solo if I don't pull too many trash mobs. Gold is quite easy to come by. I have hit the hard cap for the damage modifier mind you so...
