At Xerox we had a rotating help desk system for a while. It was pretty awful for everyone (those on the rotor and those needing support) as you quickly lose you

At Xerox we had a rotating help desk system for a while. It was pretty awful for everyone (those on the rotor and those needing support) as you quickly lose your edge at quickly fixing common issues. If you do it for one day a month (as we did) they it is just a pain in the ass as for one day a month you are expected to be able to fix weird MS Office errors or printer problems. It is always better to pay a little more and have a single person dedicated to handling such issues. There is no shortage of people wanting to get a foot in the door at low level tech support so it isn't going to blow the budget out of the water. In my experience it is actually the opposite as you end up wasting money on getting people to cover a position and they are never as effective as a dedicated person who will come across common issues and be able to resolve them much faster.