It doesn't make sense. The article mentions that OMGPOP makes 250 grand a day (that too after after all commissions). that equates to 91.25 million a year. IMHO, $200 million seems like a really small price.
Eventually they're going to run out of people to pay or play. Games don't tend to have a long lifespan, so it probably made sense for them to cash out while they're hot.
There's no way they can sustain this rate for 2+ years, which is what they'd need to do in order to make $200 million.