See, if they start doing that 1 of 2 choices would have to happen.
1) They start spending money on 510 cartomizers
2) They start spending money on 808 to 510 adapters.
Either way, its money that they will tie up in something that is going to a small audience. It is like a action figure company or better yet a toy store deciding to sell fruit, V4L knows everyone here uses 808D
batteries, so they may not make a 510 battery.
But for people like myself, who use a 510 mod with an adapter (Which they do go bad, and even if they get clogged they are cheep enough to just chuck and get a new one anyway) it would be good for us, because then we can say Hey I can get my adapter from V4L, instead of another supplier.
Now there is the XL
batteries which last all day, if not 90% of the day (My tests were from 6am till 10pm and it lasted I believe all day)