Years before I had my own devices from Bobcat and Nebra. There was times that I made over 100€ a day and the device price was between 200-2500€ because they was sold out every where and just second hand markets was selling them. So the ROI was in around 1 month already. Now I have many other hosters next to me and the rewards dropped for me. Anyway what I want to tell is that I woke up of my Helium winter sleep and discovered the Helium Farm Mining solution. So i decided to give it a try with 1 Hotspot miner. 2 Weeks later now i have stock up my inventory with 2x Mobile Plan and 3x Hotspot Plan. So the average earning since 3 days since all 5 devices are running at once is between 1.45 - 1.76 HNT per day accumulated. Now i just holding the HNT until the price will get higher again :)