What fundamentally makes a startup succeed is that the founding team builds a product that customers like and are willing to pay for. Startups that secure funding at $50+ million share some traits and tactics, which StartupGenome have written a good report about. Some of them are: using stock options, being connected to other founders and having advisors.
I believe it is possible to increase the chance of success by having the right people actively supporting a company, but that is different from “X number of advisors increase your chance to raise capital at $50+ million valuation”.
