Quite often, IT is not consulted during the strategic planning
And so corporate sets the strategy to increase sales by 10%.
And marketing and sales consult and decide the best way to do that is for field sales people to have constant access to the corporate website and intranet on the latest portable/mobile devices.
And at the end of it all, IT is given "This is what we want you to do, this is your budget."
And when the budget works out to $50/salesperson/month, not including the initial equipment buy, IT takes the hit either because the solution they could afford didn't work...again...or they went over budget...again.