Honestly, maybe it's a market specific thing, but from having worked for a carrier, the overwhelming majority of consumers just dont know anything about any phone but the brand. They'll come in store looking for "an iPhone" or "a Galaxy", and the employee will usually push them towards whichever phone has the best deal (and very often, incentives to be sold), which rarely happens to be these alternative models like the Mini. The minority who does buy their phones outright or know what they want does tend to gravitate towards larger phones, but the rest typically just buys the standard, base model.