Because, if you have this today, you will get more when VS2010 arrives:


Here’s how subscription levels will transition
:

If you have this active subscription on March 22, 2010:

…then your subscription will become this:

…and you’ll get everything you had before, plus:

Visual Studio Team System Team Suite with MSDN Premium

Visual Studio 2010 Ultimate with MSDN

Visual Studio 2010 Ultimate, Team Foundation Server 2010 + CAL

Visual Studio Team System editions with MSDN Premium (Architecture, Database, Development, Test)

Visual Studio 2010 Ultimate with MSDN

Visual Studio 2010 Ultimate, Team Foundation Server 2010 + CAL

Visual Studio Professional with MSDN Premium

Visual Studio 2010 Premium with MSDN

Visual Studio 2010 Premium, Team Foundation Server 2010 + CAL

Visual Studio Professional with MSDN Professional

Visual Studio 2010 Professional with MSDN

Visual Studio 2010 Professional, Team Foundation Server 2010 + CAL

Visual Studio Professional with MSDN Embedded

Visual Studio 2010 Professional with MSDN Embedded

Visual Studio 2010 Professional

MSDN Operating Systems

MSDN Operating Systems

 

See details of the Ultimate Offer for devs

And then there are the Windows Azure Platform benefits! https://msdn.microsoft.com/en-gb/subscriptions/ee461076.aspx