One advantage, once you've been exposed to the mold that causes the fever, you're immune to future infections (though an existing infection could reoccur at a future date).
I recently had a CAT scan done (unrelated to the valley fever) and they found some suspicious spots on my lung. After conducting some more tests they determined it was valley fever...which caused quite a stir locally as it's rarely encountered here in Ohio. I had phone calls from the health department (apparently it's a disease they're required to track), questionnaires to fill out, etc. I had the impression the doctors and health department staff were enjoying the novelty of it all.
Anyway, I was one of the 40% who never had any symptoms. Most people if they're fairly young and healthy just have flu or cold like symptoms. In rare cases it can be fatal (usually the very young, old or those with compromised immune systems). An interesting side note is that African Americans and Filipino's are more likely to get serious infections than the rest of the population.
The irony of it is there's a local mold spore that can also cause similar lung scaring and it infects about 80% of the local population...I tested negative for that one even though I've lived here practically all my life!
(I think I acquired my fever on my first trip to the Phoenix area, possibly while my friend and I were doing some hiking in the desert....)