Someone please mod the parent up.
'Success' is far better predicted by cut-throat underhanded behaviour and initial wealth than because someone 'worked hard'. An employee's ability to negotiate better than the next guy is also a huge advantage.
Here's an anecdote that I'm sure is a deja vu moment for many here:
At a company I worked at years ago, one of our best (and hardest working) software developers, was paid far less than one of the worst.
The 'worst guy' surely would have been a sales guy if it meant he could be more lazy. He'd normally just surf the net all day, but every now and then he'd spend a week or two working on what looked like foreign projects. When the big brass walked past, he'd go into 'super busy' mode where he'd frantically shuffle papers, tap keys at crazy speed, and move his head back and forth between paper specs and the monitor. I'm sure he pioneered the use of automated email sending scripts that would send out at 9pm emails drafted in the middle of the day. The guy used to do the bare minimum to fly under the radar, then when panic hit, he'd pull out and submit some work he'd been holding back and look like some sort of genius saviour. He'd even negotiate overtime rates to 'complete' the 'unfinished' work - from home, of course. One day he 'accidentally' walked in on one of the upper management guys (married) 'working overtime with the secretary'. I don't really know what he actually said, but, mysteriously, he got a pay rise - which naturally he told us all about. This guy was expert in the art of telling people just enough to come across as 'lucky' and 'hard working' rather than devious and opportunistic. He had no idea we could see right through his game, but then we weren't really the central part of his game.
That guy used to blow his own trumpet so hard that you'd be blinded in both eyes from all the stray saliva.
Luckily the guy only lasted a year before he moved on to riper pickings at a more gullible company. In fact, productivity (and morale) went up once he was gone. But, even after he'd left, the division manager and the CEO would swear blind that he was one of the most diligent and valuable guys ever to grace the company. I learned a lot from that guy (about how to play the 'system'), and I watch carefully for it in the teams that I manage. Sadly, this type of behaviour seems to be more prevalent the higher you look up in the corporate structure.
The age old idiom that 'shit floats to the top' seems to be well supported.