My back of the napkin math says that the vibesm should pay themselves off in about 3 months if they were bought at 1.5 hive and with the current hive and vibes prices. (of course since vibes are on a rocket to the moon this math is going to be made irrelevant soon ;)
I have almost 70 vibesm and average about 1 vibe per day, so since vibes are about equal with hive in price right now, that means 70 x 1.5 = 105 days until those vibesm are paid off. (actually I got in at 2 hive so a bit longer for me...)
correct me if I'm wrong cause my napkin is dirty and my math is dirtier ;)