A friend of mine once told me that she was using her
supplementary credit card to pay for game items for her Habbo
account.
She was feeling guilty about making her father pay for a few
hundred dollars' worth of stuff each time, and asked me for my
advice to make her feel less guilty.
I advised her to pay her dad in cash upfront before buying
anything using the supplementary card.... she complained that 'it
defeats the purpose of the credit card leh...'
Seriously, what's so good about these 'games' that you have to
shell out so much money for them? 
I'll only spend, if I can feel I can profit from it in time to
come. Like account, item sales etc etc. And of course time
wasted/money spent ratio plays a big part. But hundreds a go,
frequently, is abit... 
Abit too much. It's beyond addiction, they're overcompensating,
from my point of view, because they achieve more success and/or
treated better, more friends, better social 'life' in virtual
reality. People like that are willing to spend a fortune on games,
much like people who spend loads on food, alcohol, shopping,
hobbies etc.
