Quote from optioncoach:
Minor point but be careful how you describe the position values. If the APRIL short strangle expires worthless, your profit is not $3.25 in general. The entire position is opened for a net debit of $2.10 so if the APRIL strangle expires worthless you still have a net debit in the position which is $2.10. You can sell the MAY strangle for a profit if it is above $2.10 in value to sell to close.
Very good point, I didn't word that very well.
ryan