I did some installs with a trial version of DreamHost and did not get the same issue until I activated the “Platform” theme. When I went back to the Default BP theme the issue went away. I have played around with this a bit and come to the following conclusions.
1. Yahoo hosting may not be the right choice for me (and BuddyPress) because it does not provide enough control over removing databases and other files that persist even after a reinstall.
2. The Platform theme may be for more experienced WordPress users.
Not sure if this information will help future users but feel free to reach out in this thread if you are having similar issues with Yahoo and/or the Platform theme.