There's tons of basic research that could be done before we ever get to the regulatory question of human trials. If we could get pigs to live for 50 years (currently ~20) it would be a huge step forward in our understanding of aging.

On the other hand, pig life extension is not really a product you can sell. Even human life extension, which should theoretically be worth trillions if it works, seems like too much of a pipe dream. The benefits of basic research only become apparent years or decades down the road, and a lot of it is going to be dead ends.

Whereas it's pretty firmly established that if you can make a $700 smartphone that's slightly better than last year's, you can sell millions of them.

(Although apparently you can find a handful of people who want to inject sheep cells in their butt despite having no proven benefit: https://www.newscientist.com/article/mg15320660-500-germany-... )