Srila Bhaktivinoda Thakura states that householders have the right to maintain themselves through performance of their prescribed duties. But if someone voluntarily offers something to reciprocate what we have given, we may accept it. Srila Bhaktivinoda Thakura also explains that householders can join the nama-hatta. But they should earn an honest livelihood, and when it comes time to distribute the holy name or to preach, they should not do it as a way to “get rice and milk.” They should earn their livelihood first, and then distribute the holy name and Krishna conscious literature after that.
LFD Vol 2, Pg 360, last paragraph onwards