I personally liked that Spring event that metalligimp talked about. I also made a few hundred million from selling souls (my silver batteries paid themselves off within the first night of collecting

). So after about a week of selling souls and noticing that seeds no longer dropped, I headed in a new direction. I bought up every single cheap seed I could find and continued to collect the souls. By the end of the whole event, i had about 300+ green boxes to sell. Sold for first 200 for 3.5mil each since I needed some money for upgrading jewelry, then sold the last hundred for 5mil each, which gave me a net profit from the event of about 1.4-1.5bil or so. I've gotta say, I loved that event