Well, I am sure the "gain" is not a whole lot. But, you haven't hurt your gain either. You should be able to get a bit more for your transformers, and of course the wire and Al is now worth more per pound. Iron is way up, so, if you had thousands of these to do it could be way worth it.
The only thing I am not sure about is the boards with nothing more than capacitors and such left on them. But I will speculate that they will even give you something for these at the scrap yard. As long as you have enough of them. If nothing else they should just take them for nothing.
Randy