Jeff the Baptist on the frequency (or lack thereof) of communion:
This whole thing got start because at many times in church history, there haven't been enough ministers to go around. The colonial period. The westward expansion. Even now some denominations like the Methodists are having trouble meeting their staffing needs. Many denominations solved this by having ministers "ride the circuit" to several churches. You had communion when you had a minister in town, otherwise not. Depending on the size of the circuit this meant you probably wouldn't have communion more than once a month and sometimes it was a lot longer than that depending on staffing and geography. Even though a lot of churches now have their own pastors, they rarely have communion more than once a month. Why? Well because once a month was good enough back in grandpa's day... etc. The exception became common and then became the new norm.
In short, our communion schedule is more about liturgical tradition than any theological reasoning.
That's certainly true in American Methodist history, and sacramental issues were among the primary reasons why an independent Methodist denomination formed in the US apart from Anglicanism.
When I was a Southern Baptist, I never experienced a Eucharist, but as I recall, it was held twice a year on Sunday evenings, and was served to members only.