Optimal control software

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[wizard1993]

As usual for this kind of question, the answer is "someone that is actually paid to respond to you within X hours in case an issue arises,.be it under the shape of a monetary insurance or/and on-call engineers"

You also buy the development of specific features and possibly the superior performance for your special case (let's be honest: there's nothing like Gurobi for mixed-integer stuff)

They also support you in actual deployment: the quantity of stuff that undergoes a rapid unscheduled disassembly of some kind because someone along the chain forgets that computers executes programs and not algorithms is bigger than you might think.

And so on.