Traditionally, it isn't, as the costs of flying and booking hotels to attend interviews are prohibitive to many students (assuming you are not of the wealthy/upper class). However, due to the pandemic, many students are holding onto their virtual interviews which may translate to being a dead end this year. The low-to-no monetary costs of attending interviews might explain why some SDNers have 10+ interviews. I'm not saying that they don't deserve it (as they might be very strong candidates), but the lower costs of attending interviews is a contributing factor.