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Financial reasons? Yes, but not in the way you are suggesting.
Consider the amount of development time for Blizzard to handle one or more proprietary, third-party messaging programs. Consider the amount of raw "Let's make sure this system ABSOLUTELY CANNOT be exploited for nefarious purposes" testing. Now, consider the net benefit they would be providing to their customers - next to nothing, as this service is easily provided by an external program, and is in no way a feature that is tied to the game itself.
In other words, there is little to no forseeable return on investment, and worse yet, it potentially opens up gaping security holes.
However, look for the new Battle.net to open up some new doors to communication within Blizzard's games.
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