The emotional swings of being a lone wolf are definitely different than the swings in a group setting. Sure I have down days at my day job but the peaks tend to be ironed out by people on my team. Someone is always around to help get you motivated or cheer you up. Not the same when it's you and your laptop at a coffee shop. Caffeine can only cheer you up so much. :)
With that said I'm wondering if the dream of working for myself is a sustainable one? Do I need the team atmosphere to keep me motivated, excited and happy? I often take my daily working environment for granted but I think I'd miss it if I wasn't there. I tend to focus on what sucks about work but the reality is that being on a team of smart people working towards the same goal can really be fun.
So maybe Lone Wolf isn't necessarily a good and realistic thing. But I think it is viable as a startup plan. Get things moving, build some base tech, IP and/or reputation and then move onto building a team. Makes moving full time harder but perhaps more satisfying.