Okay, I checked my numbers and I was off a little bit. Right now, with 5 IGS, I make about 30k per hour, which is 5k per IGS per hour. For a full 24 hours afk, with just 1 IGS, thats 120k. With a single IGS, it would take 25 days to be able to afford a second one. With just a single IGS, it is definitely not worth it because from voting alone, you make a full cubit every ten days, which is worth around 3 million. With 2 IGS, it takes 12.5 days. With 3, just over 8 days. More realistically, nobody is afk for 24 hours a day, and being afk 8 hours a day is a little more likely. At this rate, it would take 25 days with 3 spawners. With 4 spawners, it would take under 19 days. With 5, a little exactly 15 days. If you can get to 10 igs, it would take a little more than a week to buy another one. While being able to afford 10 seems like it would take a while, there are many other ways to make money. Starting off an ig grinder with very few igs, might not make a lot of money on its own, but pairing it with your cactus farm, or with voting, you will be able to afford a tenth igs fairly quick, and at that point, it would take around a month to get to 32 spawners, using just iron golems, so using other methods, harvesting iron will definitely come out worth it.