Homemade Yogurt

So is it really worth it?
Homemade yogurt?

1/2 gallon of milk heated to 180 F
Let cool 115 F
Add a couple of tablespoons of live cultures/already made yogurt
Let sit not letting it go below 100 F
8 - 12 hours later.......
Strain with cheese cloth for a couple of hours.

Now you have greek style yogurt....

Cost -2 trader joe's greek style yogurt container for the price of 1/2 gallon of milk (Maybe $1.50 or $2.00) It is about $3 each container if you buy it in the store.

$6 worth of yogurt for $1.50.....
Amount saved. $4.50