Some would consider that a luxury as flying fields are getting scarce. If its the best you have then you can join or not join. Factors such as a lease, upkeep etc all go into dues.

We are very lucky, we have a paved runway, club house with a kitchen (though its only staffed during events), mens and ladies bathrooms and a very nice pavillion to setup planes, picnic tables, paved runway and taxi way et all. No onsite hobby shop though, that would be cool. Our dues are 20 dollars to join and 36 dollars per year which I find rather reasonable considering what we have and what other people are paying. One of the things that allows this is we are leasing the land for 1 dollar per year provided we do most of the maintenece and any improvements.

AMA is generally not included w/ club membership dues but is usually required to fly.
http://www.gatewayrc.org