So the 5 or 6 attempts at a successor that have failed miserably is still not a deterrent to their investment?

I disagree.  WoW is losing members, people are getting sick of the grind.  The first MMO to come out with something unique will be very popular.  Same with cryptocurrencies.  

I find it strange the the job posting asks applicants to mention a code-word referencing Scientology.

Does this mean the Church of Scientology knows about bitcoin and wants to push out their own version; complete with celebrity endorsement?

According to the Wikipedia Page, it may be the opposite of my initial impression:

I suppose "StealthCoin" could be a code-name, pending a better choice of name/branding.

Bitcoin came out with something unique.

They could call it OvertCoin.

(Scientology joke)

These guys don't sound serious. They want to hire only 3 people, including the CEO, and pay them a "combination of cash salary and equity", which probably means a low wage.

Somebody may eventually launch a successful variant on Bitcoin, but it will probably be someone with the resources to put prepaid cards into every 7-11 and do a large scale launch. 

A lot of the F2P MMOs are doing just fine at making money hand over fist.  Runes of Magic comes to mind.

I get the impression that the people quickest to dismiss this are heavily invested in Bitcoin (or their own blockchain).  Having worked in the valley on a number of startups over the past 10 years, I can say that nothing about their job ad is inherently "amateurish".

CEO and Software/Web Leads can be founder level positions but you can certainly hire for these positions and I don't think their offers of $75-$150k/yr are unreasonable.  We don't know how much equity they're giving up but for $150k/yr, it would be unreasonable to expect a controlling stake.  From my understanding, this project will be open source (at some point) and the investors plan to make their money back by either getting in early or through some of the extra services that they'll develop/provide for the new currency before it's publicly revealed.  It's not really clear from the post how "StealthCoin" will be created and distributed.  If it is successful, it's easy to see how there will be money to be made by being the first to offer the usual wallet/banking/exchange/merchant services for it.

I know plenty of investors and startups in the valley who hire off of CL, SO, Dice.  Hell, I know some who have hired off of OKCupid.  Everybody does not know everybody and you can't assume that you always know somebody who knows somebody who is qualified, willing and able to take on your project when you need them.  We don't know who these guys are yet and maybe they're trying to keep themselves anonymous, which would make it difficult to hire through friends.  You can call these guys jokers but in my experience the minute you say "that could never work" the impossible starts whooping your ass.

Anyway, we'll see what happens.  Maybe these guys are amateurs and maybe they're throwing their money away but that's their prerogative.  Several groups are working on blockchain forks and a few are working on completely new architectures for p2p decentralized currencies.  It's an exciting time and I think competition and innovation in this space is a great thing.  For the most part we're all on the same team.  We want one open source decentralized p2p currency to rule them all.  We just don't agree on what that technology looks like and how we're going to get there.  Personally, I'm supportive of all efforts to improve on Bitcoin and alternatives, and I think that if people want to risk their own time/money in the process of making those improvements they deserve a chance at making a profit out of it.  I don't need to criticize any efforts.  The market will do a fine job of that for me.