Security is a prime factor on shared hositng.

If your on a shared hosting server, well guess what?

The bad news is, your 1000 neighbor's with just ssh access can add stuff right into all your directories if permission's allows him/her!

Those ever lasting lurking big eyeballs are everywhere today on shared hosting servers!

You know those FTP accounts that you have, did you even disable those anonymous ftp account's ? Or did you even think about adding a password to them ?

I could see more go on until the cows come home if you really want me to, the list grows each and everyday as we speak.