I don’t know why profusehost is down, or if it will be back, but in August the owners wrote,

We are trying our best to provide our clients with the best hosting experience and we want to thank everyone for signing up with us. Recently, we encountered high amounts of sign up and it led to many server problems. As a result, we have ordered new servers that will be able to handle more traffic and provide better performance. Also, we have upgraded everyone’s Monthly bandwidth from 2 GB to 5 GB and we are still considering to provide more bandwidth over the next few months.