I have dewatted both Webleys and Enfields (along with a host of others) for guys wanting them for displays. Some are collectors of WW2 vehicles (and newer) while others are collectors of military webbing and uniforms. Even others want them for school displays around remembrance day.
The reason they want these in a deactivated state is not laziness, but rather for the ability to display them without the application of the firearms act, storeage and display regulations.
I also have one or two Enfields in deactivated state. When you drag a bren gun carrier to a parade or an airshow, you want all the racks to have their appropriate guns and ordnance in them. Thats why it's called collecting.
Just for interests sake, my Bren gun carrier holds:
2 to 3 Bren LMGs
1 to 3 Enfield rifles
1 Boys anti tank rifle
6 hand grenades
2 smoke grenades
1 ross action smoke discharger
1 Webley flare pistol with 12 rounds of (inert) flares
Add to this hundreds of rounds of dummy ammo, and usually a sten or two thrown in for goos measure, and maybe the two inch mortar with inert rounds just for fun, and you can see where a guy can have a problem keeping an eye on it all during a display. With dewats, you are within the law, and if a dewat is stolen, you are not charged for unsafe storeage.
I have pretty much all of the above in deactivated state except for the boys rifle. It is still live, and too much fun to shoot to deactivate it.
I have had guys who wanted bottom end, rougher specimens deactivated for their displays, while others have wanted nearly mint examples deactivated. One time I deactivated an Inglis hipower which likely had less than 20 rounds through it, and 95% or better of the original decal on it.