Why do insects visit the pollination drops of gnetophytes?

Insects visit the pollination drops of gnetophytes because the drops are a highly nutritious food source with a very high sugar content.1

These pollination drops are formed at the tip of the integument when a viscous solution is extruded through the micropyle of the ovule. As insects are attracted to this sugary reward, they facilitate the transfer of pollen to the plant. Once the drop dries, the pollen grains are pulled inward through the integument to the nucellus, where the pollen grain can germinate and eventually lead to fertilization.1