[S4M]

I think it's because RoR allows one developer to make an app quickly while .NET is more for a team. If you're someone who needs only one developer for your Rails app - because you were the only developer and have to move on to do something else or your current developer is leaving, you are more likely to tolerate his not being onsite if you can give him high level instructions; however, a remote team is much complicated to handle.

[meraku]

I'm not sure I that I agree with this. I've worked on plenty of projects utilizing ASP.NET during my days as a freelancer where I was the only developer. However, it might be that this is primarily a perception problem, where the types of companies using .NET simply prefer to have their team on-site, as opposed to companies utilizing RoR which may be younger and more forward-thinking, resulting in them being more open to remote workers.