Who benefits the most from this? Who can't handle it? Do you only do it for a 4v1 dive and turret kill? So on and so forth.
Let's leave tier/division out of it. You improve by trying to play at a higher skill level, not by being in the mindset that you can only play like your current placement.
If you have a top laner that's either farm independent or can farm at range 
, while their top needs to either snowball or alot of farm to be relevant 
, that is when you lane swap. Another time is when your bot is a hypercarry lane that gets stomped by the enemy lane bully lane (i.e. 
vs. 
).
[{quoted}](name=Valkyrie Witch,realm=NA,application-id=WEuoGbmp,discussion-id=h9zZERcT,comment-id=,timestamp=2015-06-14T21:41:44.800+0000)
Let's leave tier/division out of it. You improve by trying to play at a higher skill level, not by being in the mindset that you can only play like your current placement.
ADC's with a bad laning phase and high scaling benefit because they get to free farm. Top laners that scale well and need the farm like irelia/hecarim suffer from it because they get very little farm/xp.
But it's mostly a thing for organized teams to do. And even when LCS teams do it they often mess it up. If you're the adc and try that stuff in soloQ not only will your toplaner get really angry about it, you'll probably mess it up because you don't have the coordination required.
