It's hard to run for statewide office in Virginia. To be allowed on the ballot, candidates are required to get 10,000 petition signatures. (Sarvis collected nearly 18,000, but many will be invalidated for various reasons.)
It's so hard, the article notes that Sarvis "will be only the fourth minor party nominee to get on the Virginia ballot [for governor] in the last 40 years."
In 40 years, only four alternatives to the Democrapublican monopoly. Wow.