Unfortunately, broodwars, your personal preference is a separate issue to that of Sony losing a lot of money and just the raw financial risk that is making PS3 exclusives.
To limit yourself to one platform is actually a smart move. It allows intense focus and doesn't fall prey to lowest-common-denominator problems. A lot of companies best work and most beloved (and highest selling) came from a time of their exclusivity or at least hard focus on one platform, with little dalliance in anything else. This is all well and good, provided that platform has a large userbase. But without one, focusing on that particular console is retarded, no matter how loud those fanboys are, and this was even true of Nintendo fans back int he day.
The PS3, obviously, does not have one. So making exclusives for it is stupid. I'd say it should be lucky to get what it has got, as some third parties would rather risk financial collapse than not make PS3 games, even beyond all rationality, whereas other companies in a similar position would have been dropped at the first sign of slight sales momentum loss.