You want a good launch day but it is the beginning of a long story.
Lately my best money makers have been in the aws marketplace and I find my amis frequently get little or no revenue on launch day and I could get depressed about that but maybe 2 weeks or a month later I get some steady users and the month after that I get a decent check.
Think Aida or attention, interest, desire, action. It is unusual for people to buy the first time they hear about something, also trying anything new that takes any learning or thinking means you have to clear some time.