Prices aren't static. When Harpactira pulchripes first made it to the US they were selling for thousands of dollars. I know someone who paid $5,000+ for a female. I got mine for like $200. As more are produced, the prices drop. The same thing happened with Poecilotheria metallica and Monocentropus balfouri. They were insanely expensive initially, costing hundreds of dollars, but now if you look really hard you can get slings for $50-70. Some that will always have higher prices (though not THAT high) are spiders that are difficult to breed or slow growing but also very popular. Grammostola pulchra is a great example. My female is the tarantula I've had longest and she's still smaller than I'd like her to be before breeding. They have a relatively small sac (when compared to, say, LPs) and grow so slowly that the price is high because the demand is higher than supply. Thrigmopoeus psychedelicus is a beautiful spider, but, in my opinion, not the most beautiful. It just happens to be very new to the hobby. As more are imported to the US and more breeders get involved their price will come down, too.