I was able to run a test installation of D7 on a $8 a month hosting plan...... up until they decided to install mod_security, In my case, mod_security blocked the flash user agent the D7 script uses to upload media.. Hosting providers don't always let their customers know every detail about their server configuration, and for someone new, it may not be that easy to figure out. That's why I suggested a standalone script to test server configuration that people could download and run on their server, see more or give to a potential host to try, before attempting a D7 install.

Boonex's response to my suggestion was, "The Dolphin installation script already checks server configuration".