What are the seeds in tomatoes good for? ?

Aggravating your diverticulum, getting clogged up in your appendix.

growing new tomatoes. 

Zero!  There are health articles by doctor's warning not to eat the seed goo.

i've seen tomatoes growing in sludge beds.  that means they not only survived the human digestive system, they also went through the entire industrial sewage treatment process and grew into plants that produced big beautiful red tomatoes... that no one in their right mind would touch.  

Indigestion..................

Same thing your father's seed was good for.

10 years ago I had some tomatoes from Italy ....they were the best I have ever had...so I saved the seeds.

Every year I plant tomatoes from those that I saved ...I still have about 100 left. I know that they shouldn't germinate being so old, but that original batch is still producing.  

For growing more tomato plants.