Hi, let's say you've developed a high-quality software program and decided to conduct an online survey before deciding its price. The questionnaire explains that the software will be released soon, and shows a video explaining its features. After the video, the questionnaire asks one of the following.

1. How likely are you to buy this program if it is $100?
2. How likely are you to buy buy this program if it were $100?
3. How likely would you be to buy this program if it were $100?
4. How likely would you be to buy this program if it is $100?

Since the program has already been developed and will be released soon, I think #3 and #4 would sound odd, because they use the subjunctive "would you be".
(And "if it is" in #4 seems wrong to me when the program has not been developed yet.)

Only #2 seems correct to me. How about you?

 

#4 is not right, because the verb should be "were" instead of "is."
The best is #3, in my opinion, although you will probably see the #1 structure in many ads.

Note: The problem with #2 is not the grammar, but the audial clash between "are" and "were." It's not wrong, but it's slightly distracting.

 

You're right about #3. I was overthinking the differences between the four sentences. Whether the program has already been developed or not is irrelevant.
I'm a little surprised to know that the #1 structure is used in many ads.