I agree--Barnabas was the major sufferer on DS, but after watching 1795 again, I have decided that Joshua Collins suffered a great deal, too--and being a stoic 18th century man, he was expected not to show his emotions.
He lost his sister, his son, his daughter, his wife. He had Nathan's death on his conscience, too, since he knew Barnabas was responsible. He realized the innocent Vicki was doomed to go to the gallows because he had exhausted all avenues to save her. He was left alone with an insane Millicent to care for and a young boy to raise, all by himself.
That he was able to bring himself to give Ben his freedom and the money to get his start was a very generous gesture on his part, since he surely could have used his help with what he had to face.
He went on because he had to, but I bet he no longer had the heart.
For all of Barnabas' many turns of bad luck, he survived the centuries and lived with the hope of eventually finding love. I bet Joshua never felt much love from Daniel, given the way he turned out. Lonely, loveless Joshua. He was one of DS' real tragedies.
Love, Robin