how do you guys get a lot of money quick i breed high (+) monsters for example a +23 gold slime and it costs 240g to hatch and if i want a grand slime i would have to fork out another 250...

Selling pretty much everything you pick up & buying very little. Just walking around in magic key worlds will yield random items to show up on the map.

k well heres the way i make money and i have like maxd money and probely around 800 sirloins in my bank. First of all you fill up all of the spaces in your inventory, then you go to the battle arena and beat "c" class. the receptionist will say somthing about your inventory being full then she will give you 6000 coins instead of the original prize for winning... and just so oyu know you get the same amount from beating "c" class as you do for beating "s" class:P

also this way you can keep all of your rings and capes and items like that for the power boosts they give you