I have a 50 miner and botanist, and the most money I have made in the game BY FAR is just gathering clusters when they pop while i'm doing pretty much anything, then selling them. I make at least 15K per in game 4 hours (intervals) usually more if not a lot of people are gathering certain clusters (wind clusters are up to 2K on my server right now) it's pretty easy, and I also have my retainers gathering shards (getting 60 shards every 40 minutes, $$$)