Oblivious? Really? Funny I was just talking to a buddy of mine at my PT job about GO. I was telling him how GO in my neck of the woods (I'm closest to the Kitchener line) is only beneficial if you work a traditional 9 - 5 job and that if you work anything other than that it is pointless to ride the GO. I only get 5 trains at my station and they all arrive between 5 am and 9 am in the morning and depart between 3 pm and 7 pm in the evening. Not conducive if you are going to stay past 7 pm.
He has the same situation. He lives close to Kennedy station and usually winds up taking the TTC because the last train leaves Union at 7:30 pm and our job usually has us working until 10:30.
So it's not just being oblivious to GO I think most people do look at it but then realize that it only works if you have a 9 - 5 job. GO needs to realize that there is a whole other market of riders that it can reach if only it had all-day, or near all-day service.