Kneeling is seen as a sign of respect and adoration in the most important moments of the liturgy. I think the reason is also that there are few services on weekdays and very few priests, and only big cities have Orthodox parishes, and the faithful atend Church few times a year.
From what I know, there are vespers on wednesday in most of the parishes, and "Mass" (Divine Liturgy) on sundays.
Well, I don't live in the United States. Unlike the Protestant sects which have a lot of money from the USA, and the Catholic Church which is the national religion and whose priests are sometimes supported by the State and the Dioceses, the Orthodox priests do not have that.
In the Mexican Exarchate's Ascension Monastery for example, priests also work as teachers or in other things, because they don't have money. The Antiochians are in a better possition because the Arabs here are very wealthy and they have a lot of money. The Greek Diocese is in the Middle, it only has 3 priests here.