$5500/mo for a 3 bedroom property with additional appreciation is a great deal in any market.
If you're in a white collar dual income household (as most of the US and especially Torrance, California which is mentioned in the article is becoming), this is relatively affordable.
You're anyhow paying $3500-4000 to rent a similar house or apartment, and paying the landlord's principal off.
Additional building is happening in California, but it's targeting this specific demographic now.