The lighting transformers we are talking about do not contain PCBs, as you can find in other types of oil-filled type transformers.
As with gold, every tiny bit adds up, Ohh how many days have I spent in freezing cold river water to pan a few tiny flakes of gold, that was not worth all of the time or trouble spent.
Over the years that little bit adds up, maybe not to be that much in total, but now, when I look at it and with all of that work is already done.
I have something today, to show for that wasted time spent, no I cannot say it is profitable, or really worth the time and effort spent.
Not everything I do is for profit, and many things may not be worth the effort or time spent, I do consider it worth it, besides look how much fun I had, spending my spare time on something not worth it, like stocking up a scrap metal pile, and a few metals which hold enough value to buy bread someday in possible hard times ahead, instead of spending my spare time sitting at a computer screen, or in front of a tv screen...