Support (try calling google) and analysis (how to implement, how it could fit within their existing processes/systems). Your commitment (much like the pig regarding breakfast, you're committed to this). Speed/flexibility (how quick can a bug be fixed, how quick have new features been rolled out). Fit/complexity (less bells and whistles means less ways to go wrong, aka one thing really well). And I'm sure there's more... but I'm out of coffee :)

Developer's often see price as a big factor when it's not. Will the solution work and will I get promoted/fired for picking a solution are often far higher on the list than price.