The script is fine i think, but the use of it has high chance for warez. That's the problem. I've seen someone use it in hostgator, but if they found out about it then you will be suspended. Look for offshore host, but don't forget to ask first if they allow it. Since such script eats a lot of cpu resource, you better go with vps, imho. you can ask bentink, a member here, about it. iirc, webthosting offered rapidleech plan a while ago (not advertised in DP though).
i can offer vps server for 10.95$/m 10GB Space Unmetered Bandwidth 2 IP addresses LXAdmin and HyperVM Control Panel. 256 mb RAM