Most Custom Scenarios that I have are made for about 4 players. Typically, the AOEI room seems to have 20-20 users and the ROR room has 4-7. But at a given moment, maybe 80% of the people are away or in games or just want to do RMs and DMs.

I guess the best thing to do is come after normal work hours (eg. in the evening) and then host a room in the lobby and wait until someone shows up, even if that takes a long time. In that case, I eventually find a person, but naturally he wants to play right away instead of waiting for another 2-4 people to join the room.