There's someone every few months thinking they can 'do better than adultwork.' most of them have little or no experience of running an erotic services website and none on the sort of scale Adultwork provides. so someone coming along and boasting they can do it is hilarious when it's been heard so many times.
Just because the wrong people want to do it, doesn't mean it can't
Remember, once upon a time no one thought there would ever be a social network site better than MySpace...
The reason why there are so many failed adult directories and poor AW clones is because people are creating them for the wrong reasons. Instead of creating a site to provide better functionality than AW, people are creating them purely to try and 'make money' or siphon off some of that AW money. The reason why AW is so popular is because it provides what punters and providers need and does it well
It's a similar principle to why a site like Myfreecams does fantastic while other newer adult camsites just sit there gathering dust and feeling sorry for themselves.
the only downside to adultwork is the high % of fakes
The fakes and scams are a consequence of AW's success. Fraud follows money
so if anyone was to make a more popular site than AW then that would also attract the fraudsters.