Animal research is a cheap and easy option and is carried out for profit
If researchers were motivated by the desire for profit, rather than the desire to establish scientific fact, then animal experimentation is the last technique they would adopt, since it is much more expensive than other, non-animal methods.
The high cost is largely due to the number of staff required to look after the animals’ welfare. Vets are on call 24/7 and all animal technicians must have months of specific training to look after the animals.