it isn't a filesharing site, strictly storage space it seems.
That being said 2 GB for free with their ungodly expensive service is nothing.
50 GB for $50 /year or 200 GB for $100 /year is in line with all of their other overpriced services.
+1 for comcast for trying to provide backup storage for their customers
-5 for the overpriced service they are offering (tho that is status quo for comcast)