Ibanez must sell enough more-expensive basses to offset the cheap ones. If they didn't, they'd be in trouble too. SX shovels cheap knockoffs and is irrelevant to Fender's situation/stature. I certainly don't think Fender looks to SX's business model.
You said they cant stay in business selling $300 basses when thats exactly what they have been doing for decades. You should start posting in the bass snob thread.