A $150 one time cost certainly isn't harmful if they know the one time cost going in. What could be harmful is if the post-launch support is lacking. Especially

A $150 one time cost certainly isn't harmful if they know the one time cost going in. What could be harmful is if the post-launch support is lacking. Especially if they consider deploying Wordpress sites which need near constant updating and a pretty strong knowledge about which plugins to avoid at all costs.