9. The design looks like crap
If you're a fan of a designer or brand, wouldn't you expect them to hold their website standards to the same ones as their products? Do you really expect a dope brand is going to sell their stuff on an e-commerce platform with all the sophistication of a Geocities website? Many stores and brands know that e-commerce execution is as important as their retail displays, and spend tons of money perfecting the design of their sites to make sure they reflect the cachet of their brand.