The realtor that makes money off a sale is the seller's realtor, the buyer's rep makes a pittance.
The more the house costs, though, the more hey make - it's a tiny percentage, but a percentage nonetheless. You're just not worth their time unless you buy big, and even then...
So really, it's the low budget thing. But May's right, you don't need a realtor to go look at listings. Contact the selling realtors directly and arrange for viewings. Then, when you find a place you want to make an offer on, try to get a real estate lawyer, not a realtor. They're better with the contracts, and if you can find one that will work for a fee, not a percentage, they won't screw you for a buck or two.
Please note; I bought my house at an auction. Whole different ball o' wax.