Since dropbox's valuation might be bigger than that of all the other YC companies (including airbnb) combined, it serves as blazing evidence that you don't need

Since dropbox's valuation might be bigger than that of all the other YC companies (including airbnb) combined, it serves as blazing evidence that you don't need a cofounder. Possibly the truth is that singlefounder companies have more struggles but are capable of bigger wins (which is what investors should want). Kinda how many succesful dyslexics (like Ari Emmanuel) credit dyslexia for their success. The fact is that many of the extraordinary people YC looks for are often written off by YC's own bias against single founders. That's silly, but in the end it hurts YC more than the founder, because of all the other Dropboxes they miss out on. So forgive them for knowing not what they do. An investor usually has only one chance to pass or invest, whereas the entrepreneur has many chances to succeed. Single founder or not, if you are tenacious you will keep having chances for as long as you are willing to fight. Many more chances than any one investor does.