Why not? If I want red wisps I go to golem court or night side. If I want blue wisps I walk around town. I don't see the harm in having whisps spawn at my house. If I have to pay to get a spawning point for whisps I wouldn't mind.
I had suggested this as a fountain that generates wisps, with a limit per area. People may say "Well I can go to this place", but if you just want to top off, this is a great place to do it, especially if you need to use your house for whatever reason.
I love the idea, and even if you can't buy a spawning point could have wisps at our houses anyway? It's been bugging me since I started Mooshu. It would be good if we could get wisps to top up our pet's stamina as well, or we could trade pet stamina for health.