Why should these employees need to receive half pay when there is opportunity for them to receive full pay working on a different problem? I'm sure they could make great waiters at a local restaurant and receive a livable wage, but is it the best use of the opportunities they have? I'm going to go out on a limb and assume those 6 employees were excellent given how well Everpix was run.
Yes, you're right. But does a photo sharing service really need those kind of employees? Is there a need to be located at a technology cluster like the SV where developers are expensive and a scarce resource?
Services like Everpix are - in terms of technology - pretty trivial. They can be built anywhere in the world by average developers. No need to hire expensive Stanford PHDs to do a job a kid from the local community college in Kentucky could do.
The fact that there's already entrenched photo sharing kings means that you don't have to be first to market, overspend, or rush. There's no time crunch here, meaning that a great product could have been built well - over time - on budget, and still have had success.
Did you even read the article? The photo storage / sharing / librarian market is HUGE. Definitely large enough to support multiple players, even marginal ones that make $3-400k/yr.