Well, TOS and TAS have a number of outright capitalists -- Harry Mudd, Cyrano Jones, the K7 bartender, Flint (who was rich enough to buy a planet), Carter Winston. Also, the Rigel XII miners in "Mudd's Women" were apparently in it for profit, as were the pergium miners on Janus VI, since Kirk said working with the Hortas would make them "embarrassingly rich." The whole post-capitalist, moneyless economy thing doesn't kick in until the TNG era, which makes sense, because they apparently didn't have proper replicators yet in the 23rd century. (Although Kirk did say in "Catspaw" that they could synthesize an endless supply of gemstones so that such things were no longer considered valuable.)