I'm thinking this is it: the huge amount of more casual Verizon buyers — the ones whose arrival to the App Store I’ve been eagerly awaiting — are far more likely to wait for their contracts to expire.

Most of the people I know who are on Verizon and are Mac focused or Tech savvy have either an iPad or iPod Touch, and already have the apps they want.

Also, Instapaper is pretty darn geeky in the grand scheme of things - It's somewhere between RSS readers and Dropbox in terms of non-technical user acceptance.