Let it provide a certain reasonable (enough to license a humble number of themes, not enough for a big business to run for a long time) amount of service free f

Let it provide a certain reasonable (enough to license a humble number of themes, not enough for a big business to run for a long time) amount of service free forever, not for a 7-day trial period, 7-day trial periods are almost useless. And/or add a killer-feature everybody would quickly realize they can't live without and spread the word.