I have a question though, what stops rain water from getting into the inlet and making it's way to the engine? and wouldn't a snorkel suck in more dirt and debris as it is located outside facing forward?
The snorkels are designed to minimize the amount of rain that gets in - a fair bit of engineering expertise goes into them - which is one of the reasons they cost more than drain pipe and duct tape.
Now - let's start with a visit to the ARB
website and see what they have to say about snorkels - whilst you're there I want you to look closely at the first picture on the page I linked to - it's not a fake - only the lead vehicle in a convoy runs in "clean air", and the further back you are the worse it gets.
Imagine how much dust is being drawn into the under hood area of the trailing vehicles (and that's where that shiny K&N Apollo get's it's "fresh" air)
Next - if you have the time - pull out the fender well lining and see where the standard intake draws it's air from - I also think you'll find there's quite a bit more in there than you expected.
A snorkel puts the air intake higher up, further out of the dust cloud and it
does significantly reduce the amount of dust ingested by the engine - they're not just for water crossings.
Down here in Guyana (and I know you where that is, and what the terrain here is like), in the dry season I'll see your dust cloud long before I see you - we flip the snorkel head around so that it faces backwards to further reduce the dust ingestion.
Maybe the next time my daughter comes home, I'll take a couple of pictures of her truck and post them for you - it's not a Suzuki though - she drives a double cab, turbo diesel Toyota Hilux - snorkel, bumper, winch - and believe me. none of it's for show.
Edit -
Here's the Safari Snorkel FAQ - it shows a bit of the head design principles that separate the rain from the intake air.