There are certainly benefits to having everyone upgrade at the same time, though. From a technical standpoint, it seems better to have everyone on the same set

There are certainly benefits to having everyone upgrade at the same time, though. From a technical standpoint, it seems better to have everyone on the same setup so that you only have to deal with the same set of problems. You might also be able to get a deal for buying in bulk. Additionally, it would be frustrating to use your credits too soon and then the guy next to you gets something twice as good one month later. So just play it safe by keeping everyone on the same playing field.