I'd have to agree-- trusting a shared hosting environment with a Bitcoin wallet is a huge no-no. However, I personally wouldn't be worried about the hosting provider stealing your wallet-- I'd worry a lot more about the fact that it's a *shared hosting environment*. This means that your wallet is sitting on the same box that other people use. If there's ever a privilege escalation vulnerability in a piece of software on the machine (and trust me, there will be at some point. There's always going to be some time before they patch new exploits that come out), your funds are simply not safe.