Because developers are expensive, but no hardware or tools. If you purchase resharper and save an hour a day during development, 25 bucks an hour, you will lose your losses in less than two weeks.
There is no significant training time, because Resharper is written well enough that it takes less time to learn how to use each function than it does to do what the developer is trying to do. Once.
If nothing else, just follow these steps with the specified manager:
Navigate to a function DoStuff in unopened (large) class SuperDuperUtility by hand/mouse.
Close window.
(With resharper installed:) CTRL+T SDU <ENTER> ALT+\ DS <ENTER>
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