Sell spreads aka verticals

Using your same example on FB:
Sell Put $140 1 contract
Buy Put $130 1 contract
= Margin required $10 spread *100

OR
Sell Put $140 1 contract
Buy Put $135 1 contract
= Margin required $5 spread *100

hehe - think cost of time decay or Theta

When U BUY an option, U are buying the TIME + CONTRACTUAL RIGHT (extrinsic value)
As the time of the contract passes, what do U think will happen to the cost or premium of the option, assuming the underlying doesn't move?

ALSO - when U Buy an option AND don't have the $ to exercise the option (which is usually the case -100 units of FB, imagine) - how to make $?
U turn around & sell your option right?
By the time U sell your option, the contract DTE (Days to Expiry) is shorter than when U bought right?
So.. the value of the option, again assuming all else being the same like no movement in underlying, U can sell for higher or lower premium than your BUY cost?

If U can answer the above clearly, U will have answered your own Q whether feasible or not

Sorry ar - i usually ask Qs for clarity or leading one to find one's own answer coz i ain't no sifu, still big L (learner) plate