At DreamHost, the user's home directory is set to 751 by default, and cannot be changed by the user. As already mentioned, this prevents "others" from listing files and directories in your home area and stops all except the most "determined". You create your own "bin" if you want one, so it can be named anything you want, to make guessing harder.
Ours are mostly customers; I should know.
They recently hired more support help.
Tip me (and DreamHost gets 5%+$0.30)