In my opinion, that's pretty good for the Juul. If I had one, I might go through 3 cartridges in a day, if one is supposed to be equivalent to a pack of cigarettes. But if it's working for you that's fantastic! I prefer mixing my own nic salts for far less money, but for a starting quitting device, the Juul can't be beat for a cig-a-like, probably, honestly. I do think it's probably the best quitting smoking cig-a-like on the market, from what folks are saying and the price reflects that.
Glad you are enjoying yours...
Anna