That's why I would never get season seats for the Blue Jays or any baseball team unless it was the Red Sox or Cubs. Too many games to try and sell, which like you said could be stressful and requires you to put a lot of time in. Tough thing about baseball is that you might be required to unload tickets to 6 or 7 straight games all in one week, unlike with basketball or hockey tickets. Only way you can really get season tickets is if you get 3-4 people to in with you, so you get around 20 games each.
I'll just select & pay for the games I want to go to, even if it means sometimes spending $10-20 more above the season seat holder rate. Plus, like you said seats on StubHub are going for far below face value, so doesn't even make sense purchasing seats from the box office.