OK, I'll bite.
Occam's Razor applied:
Legislators trying to ban indoor use = prohibitionist motivation, as it doesn't protect
tobacco sales and therefore tax revenue (and pharma sales)
Legislators trying to ban sales = monetary motivation, as it protects
tobacco sales and therefore tax revenue (and pharma sales)
What have we been fighting 99% of the time? Indoor use bans, with the exception of New York and California. (California's governor vetoed their proposed ban, so apparently wasn't swayed by the lost money. So that leaves only New York.)
Therefore, if they are proposing indoor use bans and not sales bans, the most likely reason is prohibitionist, not monetary.
Occam's razor applied:
Legal e-cigs equals less government money.
Illegal e-cigs equals more government money.
It doesn't get any simpler than that. Oh sure...there are plenty of fascists out there that have warped Utopian ideas to go along with their feelings of inadequacy and wake up each morning measuring their body parts. But ultimately....cash is king.