Clarifying a few things regarding Wirecast.

You can have Wirecast actively licensed on two systems at the same time. You can easily move the licenses from machine to machine as needed (wait about 15 minutes for deactivation/reactivation)
This means you can have a backup system up and running at the same time if one system should go down. For some this is a must in a professional streaming environment.
Also these two system can even be different OSs, one on Mac one on Windows at the same time.
This also allows you to take advantage of OS specific features. For example, on Mac you can record to Apple ProRes which is good for post workflow. On Windows you can record to WMV and stream MMS.
VidBlaster limits upload to 1mbps unless one goes to Broadcast version (30mbps) which is nearly $2K for Single license and nearly $6K for Desktop License. Wirecast has no limit even at $495 (and see licensing above). This also means it's easy to do a 720 stream in Wirecast in the base priced version.
Note that Ustream and YouTube have Wirecast versions that are limited to their services at much lower prices starting at free.
As per Joe's comments yes, even if you're only streaming at a standard def frame size you may be recording at 720 or 1080 for post workflow for VOD use.
Wirecast streams to multiple servers with the $495 version whereas VidBlaster requires Broadcast.
You'll probably see more features at the same price points when Wirecast 5 arrives very soon.
Premium support is an optional addition which not only includes phone support but remote access so support can login to your system to help troubleshoot. Email support is also expedited.
Regarding sports, Wirecast Windows can integrate with Xos Digital Thundercloud live scoreboard service.
There's no "module" limit. As many shots as your system can handle each can be 7 layers deep and with 5 additional Master Layers.
Don't underestimate the important of built in x264 encoding and its ability to customize so you can use a single computer for both switching and live streaming without overrunning the CPU resources.