Use of daVinci w/FireFly can eliminate the need for re operation in some cases resulting in significant cost savings. Expect to see MUCH more of this in the coming years.
Here is an excerpt from a recent article explaining how. (Link to full article below)
"One way to ensure complete removal of a tumor is to take tissue samples along the tumor margin. The samples are sent to a lab for analysis. Although this method is usually effective, it has limits. It takes time to process the cells and by the time the results are in, patients are already recovering from the surgery. If cancer cells are found, the patient may need to come back to the hospital for more surgery."
You are ignoring the difference between small surface tumors and tumors of any size on an internal organ, not to mention the difference in kind between veterinary and human surgery.
Did you read/understand the article? The answers are in there.
They can get clean margins by erring on the side of leaving a wide margin of safety but this comes at the expense of taking more healthy tissue than necessary. Depending on the organ, this can be significant. Most of the time the margins are clean but the times when they are not it is very costly. In many cases the hospital eats the cost of a second surgery which can easily cost $30k to $50k or more. When you spread the savings of not having those reops over the total number of procedures it can come out to thousands of dollars in savings per procedure. This can more that offset the cost of using the robot to begin with.