If you have high arches like I do and must walk miles on concrete, you get to a point you'll only buy shoes with solid arch support to avoid feet pain (and surgery) in the future. Ideally all your shoes should stabilize your heels too, but doctors know people desire sandals during the summer. If we must wear flip flops, pediatrists have said Vionic flip flops with arch support are way better than other flimsy options.
The orthotic shoes are expensive, yes ... yet not Chanel or Dior expensive, and they go on sale several times a year. It's worth monitoring the brand to snatch up a pair during one of its promotions. I have 2 pairs of leather ballet flats and a pair of block high heels I got greatly reduced. And while I'd rather not pay full price, it's not "designer" unreasonable for such quality, supportive, durable and classic shoes.
No longer will I buy fashion shoes that only look good. Nowadays I don't have to sacrifice style for comfort. Vionic orthotic arch support shoes are as chic as non-orthotic shoes! The company just launched their new spring collection. It's a brand I own and highly recommend!