Hubspot has a very different client base and sales system than Moz does. Hubspot sells their services and tools directly to small business owners and it is not cheap at all. Moz sells to SEOs, of which there aren't a lot of and the pool is drying up slowly every day.
Last I checked Hubspot will be filing an IPO with close to 1 billion dollars market cap.
Hootsuite also will be approaching 1 billion market cap when they file their IPO.