[totaldex]

These effectively boil down to ROI - it's tricky to quantify what return a tool will give, but its even harder to quantify the cost of switching over. At a big enough company, most will shudder at the thought of a massive migration without an equally passive payoff.

[FastMonkey]

A payoff has to happen over years too. Sure you optimally ignore sunk costs when looking at a given project, but if you keep ditching solutions 2 years into a 3-year payoff you're going to lose a bunch of money.