I've often wondered this too, so I'll take a stab at why it hasnt: - in mmos the transactions are impulse buys and often not major decision points for the purc

I've often wondered this too, so I'll take a stab at why it hasnt: - in mmos the transactions are impulse buys and often not major decision points for the purchaser. The "do I need this?" question isn't a high priority. Of course you need your virtual crops to grow faster. - with web apps, especially saas apps, this isn't an impulse buy. You've been trying the app out for a while and every dollar you spend is accountable. You're much more likely to ask "do I really need this?"