Having always been a collector of things, it never occurred to me that other home cinema enthusiasts would not all own large amounts of DVDs. I now realise that many people buy discs to watch once, then trade them on. This clearly has many advantages, such as low cost and no chance of being stuck with a huge amount of obsolete software when a new format comes along. Despite this I still prefer to have my collection at hand as I rarely know until the last minute what I fancy watching. I know we probably all do a little of both, but are you mostly a trader or a collector?