Wait, I thought the "Castle in the Sky" saying had a negative connotation ? 
People think it's a nice name for a service ?
A phrase or colloquialism which is a reference to the full metaphor "[He/She] has built castles in the sky but lives in squalor on the ground." This is usually intended to be a criticism of any person who has a rich imagination but does not benefit from it in any measurable or practical way. As an example: A "starving artist". It is to say that a person's reality is quite different from their imagined life.
People think it's a nice name for a service ?