We have tried running the server without bots in the begining and it didn't work out. We didn't have a lot of clan members who bought the game so at first it was only 3-4 of us trying to jumpstart the server each day. As soon as we added some bots, it became easier. We're not RO veterans but we're trying our best to support the game and keep it alive. I think we created a good place for newer players to have fun.
The first 2-3 servers (based on GT stats) are almost always full (64 slot) and these servers already have their regular players. Other servers don't have this luxury, so there's basically no other way but to resort to bots until you get the server going. The current player numbers are really low for this game, so it's not a walk in the park to attract players who scatter around almost left for dead servers.
And believe me, if we had a choice, we would get rid of the bots right away. Personally I'm sick and tired of seeing Ivan and Fritz running on the spot near the wall or getting stuck somewhere and going back and forth like headless chickens. But there's just not enough players playing this game to have more potential full servers at this point.
Also, our server gets full every day around 3-5 PM GMT and it gets empty around 10-12 PM GMT simply because people want to get some sleep as they have to go to work or to school, or somewhere else. We can't expect people from USA to join the server during the night because the ping is too high (our server is located in London). So you see the problems that people are dealing with..