sir ROWDY said...Good luck using that theory on Emirates

... No one is above Emirates, anything over 30kgs and your a goner, doesn't matter what it is.
p.s. I do carry 20kg or more in carry on though haha.
Don't ever pack any single piece over 30kg - It's more of a manual handling/safety thing for the baggage dudes and most airlines are pretty strict on that issue.
Carry on is your friend - it is amazing how many clothes you can get into a duffle bag or daypack (screw wheelie bags - they are heavy before you put anything into them, and you can't wheel a kitebag AND a wheelie bag!) that meets carry on dimensions and still only be ~10kg. Then save your checked in allowance for your kiting gear!
But my best travel tip is to turn up reasonably presentable and have all your documents to hand, with everything packed properly. (Don't be trying to work out where to stuff that last pair of shoes in the check in queue) If you look like you'll be a breeze to check in, then the staff will usually go with it.