What you say is perfectly true, 500grains, but there is a modicum of the 'gun collector' spirit in many of us, which invokes long hours on the internet researching the provenance of old guns in our custody, and even the discharge of sums of money to the current owners of company records from the 'Old Country'. Witness some of the threads on these very forums, eg Abido Inkidar, Leonard/Jeffery, etc

Just further enrichment of an already marvellous sport and hobby I guess.