You can take the boat yourself in most crewed fleets. Generally however you are responsible for putting the crew up somewhere during that time.
We looked into crewed options before we purchased our boat in early 2021 - we want to sail 2-3 weeks at a time 3-4 times a year and therefore it makes little sense for us (we don’t want crew aboard) as we would be putting the crew up and paying them while using the boat. We are (so far) very happy with TMM and their protocols.
