If you looked at thirty houses, a couple things probably happened. The realtor didn't ask you the right questions about what you were looking for or you didn't communicate well what you wanted. Or you didn't know what you wanted. Either way, I would've kicked you to the curb long before that.
Depends what you're looking for, and also on how accurately the houses are portrayed in their listings. Some houses look exactly as they appear in the listing and photographs. Others mask or hide glaring problems.
Last time I bought a house, I was looking for a Canton rowhouse to renovate. So the goal was to go look at houses that looked crappy, and see if they had the bones to be converted into something really nice. That sort of thing doesn't show up in a listing, you've gotta go see it in person. So while I only ever went and looked at places that could have worked, I probably saw two to three dozen houses easily before finding the one that really fit my goals.
It takes what, half an hour to see a house? The realtor gets 3% commission on the house. So for a typical rowhome in Canton, that's maybe $6-12k. Get one commission a month and you're probably making enough to survive, even after your agency and taxes and whatever other bites get taken from that.
Also, I think once a realtor takes you on as a client, they legally cannot 'kick you to the curb'. They have to remain your realtor and work in good faith.