Nowadays lots of people know about WB but not about Zenni and the other mass-market retailers, which speaks to the success of WB's marketing efforts.
Nowadays I think they do bulk shipping to a US outpost, then ship on from there using USPS to save costs.
I'm not sure it's a great comparison as WP is delivering on several other levels beyond price. The Zenni buying experience is decidedly inferior.
But despite the quality, theres some pretty stylish options that are perfect for people with no optical insurance :D
Also worth noting, the shipping time on Zenni takes forever. Forever being at least a couple weeks in my experience, but in fairness I haven't ordered recently.
The issue with Zenni (and others where the lenses are produced outside the country) is they don't have the stringent quality control standards for lenses you find in the US, Canada and Europe.
If you have a fairly common and simple prescription, go for it. If you need progressives or bifocals, you should probably avoid buying online.
If you have a normal range of eye correction and your face isn't too oddly shaped, I highly recommend these stores.
The UI could use some work, true, but the savings on the frames is well worth the minimal inconvenience.
The cost to produce a pair of $25 and a pair of $100 sunglasses really can't be that different. Charging $100 signals the product should be good...but would anyone be able to guess that price when handed a pair with the name obscured?
Maybe it's different for their prescription versions.