This setup shows the maximum losses, and in the end my real losses. To get max you must be really unlucky.
So max loses with vet: 530R, 50C
Max losses without vet: 547R, 75C, 19M
So even in worst cases you save 17R, 25C, 19M. I say it was worth the buy.
If anyone is willing to start of a new extensive adventure topic like Sidv had please feel free to use my results.