For buyers, any form of hiding your Tor use is overkill. I see no problem with using Tor directly from home. Honestly, you're not that important. For vendors, especially big time vendors, I recommend hiding your Tor use because of a theoretical attack that I've explained before: http://dkn255hz262ypmii.onion/index.php?topic=173679.msg1249891#msg1249891 Best way to do that is VPNs + obfsproxy bridges.