You'd think they'd make more of an attempt to bring other races into the series as serving crew members.
http://www.reocities.com/therinofandor/UFP.html
They did. Every time the budget permitted. See the rec deck scene of ST:TMP.
Any time you add a alien crewmember, you add $$$$$$$ to the budget, and hours in the makeup chair for some hapless actor or extra. And if they are going to get closeups or dialogue, the makeup has to be either less elaborate or more complicated.
The novelists make up for this, as they have no budget for casting. The first Pocket original novel, "The Entropy Effect", added numerous new alien crewmembers and "The Wounded Sky" added a whole lot more. "My Enemy, My Ally" added a semi-regular Horta crewmember. The various comic publishers did this type of stuff, too.
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