Congratulations! That is a good feeling to see money trickling in.
Since I am probably one of the older ones here let me tell you about my experience in the 90's. I had written a time synchronization program for Windows NT and put it on the internets for anyone to download and use. Many did. Intriguingly, I got emails from two large Wall Street financial companies saying that they would like to install on their servers/workstations but my policy of "giving it away" would imply that they could NOT use it; I would have to charge something for it, they said. Ok, I told them and set a price which they happily paid. Those were olden times.
Since I am probably one of the older ones here let me tell you about my experience in the 90's. I had written a time synchronization program for Windows NT and put it on the internets for anyone to download and use. Many did. Intriguingly, I got emails from two large Wall Street financial companies saying that they would like to install on their servers/workstations but my policy of "giving it away" would imply that they could NOT use it; I would have to charge something for it, they said. Ok, I told them and set a price which they happily paid. Those were olden times.