Same here - As I stocked up over the years I made sure that almost everything was interchangeable and rebuildable.  Comes in handy down the line if I have to cannibalize anything.  And Yep I am a tootle puffer and while I do not like that term - it is what it is...  But my stock will last longer that way and I am still staying off of the smokes, which is my ultimate goal.
During this latest great stock up I had very little to purchase - fill in the gaps and reinforce my stock so to speak...  Shoot I am just now getting to the last few 120ml bottles of nic I bought in 2012.
In the future I will need batts - maybe once every 5 years, flavoring,  and wick/wire.  That's about it - almost negligible... 
 
And unlike TJ - I do not have a 50 yr supply... 


