No I think it is the sales that counts. That 200k salesperson will of course make PowerPoint decks showing all the support options. But, the main barrier to take is convincing 10+ people with different incentives to all sign off on your product, and that is what enterprise sales gets done.

Can concur. A software project could be feasibly implemented in-house but in-house technological teams are both under-staffed (lots of "teams" of just one or two people) and the staff themselves have much lower salaries compared to a similar role in the private sector. As a result, there's no incentive for technologically competent staff to stick around and provide support for software/systems that they implement.

On the other hand, there are very large budgets available for purchasing software with support contracts and even more so for IT consultancy services. In practice, this neo-liberal push to outsource rather than develop in-house capabilities results in all sorts of inefficiencies and deficiencies in the ability of public servants to provide a quality public service.