What’s fun when you are watching a lovely sunset and think “it’s a wonderful view, isn’t it?” and there is no one to answer, “it sure is”?
Why would anyone want to travel half-way around the world, to spend couple of weeks worth of vacation, and come by himself alone? I am sure it depends on person to person but if people on popular India travel forum indiamike.com are any indicator then western tourists like to travel alone more often relatively speaking. I feel half the fun of trip is in the company. Any trip, not just international trip, in fact. Sure, travelling in group implies compromises about where to go and what to do, so smaller group size of 3-4 is preferable but wandering singleton seems overkill. Talking to strangers can be fun but that’s not excluded in group anyway. Could not being able to find a partner to travel be real reason, since travelling to India is not like hopping to Vegas anyway?