Maybe when making very high gravity beers. But otherwise, by the time the 2nd sparge is complete there shouldn't be much sugar left. SG of my 3rd runnings are around 1.020-1.030 (max). Depending on volume, a 3rd sparge (4th runnings) may be around 1.005-1.014. It costs a lot of energy to boil those few points down to a decent parti-gyle beer gravity and there won't be much of it.First, you should make a parti-gyle. Just rinse the grains in some clean 170 degree water and brew with that. Free beer!
I've tried baking with it but the grains end up being so rough that I've stopped. I compost with them but have had a big problem with the grains attracting flies. I like the idea of using them for animal feed but I live in the city so minimal animals to feed other than squirrels.