hi guys, well i use RDA's and i use the prebuilt coils for it , what i find that there is a box of 48 coils of different builds that might cost from 15- 20 dollars or maybe less , and i find that there is a builder that sells the pack of 2 coils with the price of like 10-15 dollars , so all i need to know why the builders coils are much more expensive due to quantity of coils does the life of the coils is different , is the taste better , because i wouldn't pay 15 dollar in pack of 2 coils that would last me 3 or 4 days like a regular 1 dollar coil , and last but not least if i want to build my own coils , if i want a low ohm should the warps be more or less lets say i want a dual coil to make 0.13 or 0.15 ohm how many wraps should i warp each coil ?