Any question answered...

I HAVE A Q!

so i have a 48x17t gear set up, currently single speed at the moment because i'm feeling wussy this month. i put a new kmc z510 chain on it a few weeks ago and i lube it occasionally with that finish line ceramic wet lube.
already it has needed tensioning twice and chain wear is neeeaaarrly at .50
what the hell? it's the chronicles of ridiculous!

any idea what causes extremely fast chain wear?

Cog/chainrings was probably worn as well causing the chain to wear a lots quicker.

You don't need to lube it straight away as it's already covered in wax, too much lube can actually increase wear and tear due to collect dirt and grim from London 's famous London.

Chain that on too tight that bind also accelerate the wear and tear.

Since you mentioned you switch to what sound like a barely use freewheels due to being a wussy, the chainrings might be the curpit.