Just wondering, is afterrun needed in the engine?

Usually I run my engine until the tank is empty, then when it shuts off I drain whatever might be left, put the glow battery on and pull the coil so it starts a few times and runs a couple of seconds then shuts off, and after that I pull the coil with the plug out and upside down, and also with exhaust facing down

Also, I often open the engine, soak things in fuel, then take it out to dry and assemble it
And before starting it, I drop fuel into the plug hole, and make it spin a few times to lubricate

Am I doing anything wrong?