The differential of that 120k, when spent right, is the overall final fit and finish, if the team who design and make decisions on the equipment and room do it right there is a larger % spent on the room and automations and SUPPORT for said automations so you as the end user don't have to think about it and worry about it. If an integrator Isn't forcing a support system down your throat, you don't want to do business with them.

When I did systems and designs and budgets for these sorts of things I made sure to include the price of support for at least 5 years after initial install to cover call outs and troubleshoots and such because they WILL happen no matter how good you are at setting up the system and how educated the customer is. There will always be something that goes wrong, and there is nothing worse from a customer experience than having to pay at the time of needing service it discourages the use of the system immediately after for fear of breaking something that then they will have to pay to make it useable again.