On several occasions, I, and other forum members, have stated that we believe the total cost of ownership of these new devices being called 'mods' is lower than an average e-cig starter kit. A mod would be a device like the Screwdriver, Prodigy, and GG, to name a few. Most often it is stated how much cheaper an RCR123a or CR2 battery is over the replacement cost of a typical screw-in battery as a cost-savings example. I was pretty much on board with this concept until this evening. The one area we often forget to count in the total cost of ownership calculation is the cost of e-liquid.
The calculations are an attempt to represent an average number of supplies needed to vape for one year plus the initial cost of a device. It does not consider that many users buy extra batteries based on the amount of vaping they do each day. Nor do the numbers reflect personal preferences like throat hit, vapor production, durability, or aesthetics. Because high-voltage vaping (HVV) devices vape through more e-liquid than a standard voltage device, I did increase the milliliters of juice needed to run a Prodigy per day over a typical DSE901.
Below is a quick MS Excel calculation comparing the first year cost of a standard DSE901 Starter Kit and the Prodigy. I randomly chose the Prodigy because it ships as a complete vaping kit. The cost difference looks to be rather substantial and in favor of the DSE901 strictly when considering cost.
Total Cost Of Ownership Calculation
I encourage your comments and discussion on the Total Cost of Ownership Worksheet. Please point out mistakes in my calculations, correct any incorrect assumptions, or recommend other factors I may have missed. For now, I will promote those features of mod devices that I feel are superior to the many standard e-cig models, but cannot any longer claim that they will be cheaper to operate, at least during the first year of use.
The calculations are an attempt to represent an average number of supplies needed to vape for one year plus the initial cost of a device. It does not consider that many users buy extra batteries based on the amount of vaping they do each day. Nor do the numbers reflect personal preferences like throat hit, vapor production, durability, or aesthetics. Because high-voltage vaping (HVV) devices vape through more e-liquid than a standard voltage device, I did increase the milliliters of juice needed to run a Prodigy per day over a typical DSE901.
Below is a quick MS Excel calculation comparing the first year cost of a standard DSE901 Starter Kit and the Prodigy. I randomly chose the Prodigy because it ships as a complete vaping kit. The cost difference looks to be rather substantial and in favor of the DSE901 strictly when considering cost.
Total Cost Of Ownership Calculation

I encourage your comments and discussion on the Total Cost of Ownership Worksheet. Please point out mistakes in my calculations, correct any incorrect assumptions, or recommend other factors I may have missed. For now, I will promote those features of mod devices that I feel are superior to the many standard e-cig models, but cannot any longer claim that they will be cheaper to operate, at least during the first year of use.