Other retailers (Revolve, Atrium, etc.) are significantly different from Spring. JE has already made their money selling to those retailers at wholesale. With Spring, you're buying directly out of JE's online inventory. Spring has plenty of sales. There was a one day only 25% off sale just over two weeks ago, with a 20% off sale a month before that. There is currently a one day only 20% off sale in addition to the 25% off single-use promotion. Considering JE's only webshop promotion, Black Friday, is at most 20% off and only happens once every year, this seems like a sound e-commerce decision.