Real life example
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I set up a fresh Bitcoin address/Bitcoin Client in a VPS hosted in Panama, connected via Tor.
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I purchase a 100 EUR paysafecard code at some newsagent in a big, densely populated city. I pay cash, and make sure the newsagent is 2 km away from my home.
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I advertise the sale of the paysafecard code on this forum, via Tor and a free public wifi hotspot, using a fresh username.
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A buyer shows up. I send him my bitcoin address and the paysafecard code from a freshly set up webmail address, again via Tor and a free public wifi hotspot.
Using above precautions, it will be very difficult to link my physical identity to my bitcoin address. Not impossible, but difficult enough for my purposes.