See what the actual cost of my services would be WITHOUT my MSDN subscription
Show what the actual real-world costs would be when I make my application live and it no longer qualifies for MSDN discounts I can predict my budget - i.e How much I need to go live.
a "Based on your current daily spend of xx.xx - making this subscription live would cost ***.xx per day"
Another 'nice to have' may be "based on your previous 30 day usage - We recommend you upgrade zzzz service to xxxxx i.e S1 DB to a S2

Great idea! This sounds like the cloud comparison capability in Azure Cost Management today. In this case, you would be able to compare the workload across subscription offer types. Does that sound right? Let us know and we’ll consider it as it gets voted up.