If I'm Go Hero, I want to hear what people think about the price. Ignoring it is foolish.
Demand is a function of price - pretty basic economics. In general, as price goes up, demand goes down. What price should they charge? The one that generates the maximum profit. While it's important to take cost into consideration (duh), companies prefer if you believe that they decide what to charge based on something simple, like, it costs me $100 to make this and I want to make $20 in profit. That's not the case, or at least not if they are smart. Prices should obviously cover cost, but the amount of profit is entirely dependent on what the market is willing to pay. If it costs me $100 to make a figure and you're willing to pay $300, I shouldn't charge $200. If I do, what happens is what we see with the secondary market - someone else buys them up at $200 and sells them for $300 on ebay. Hot Toys saw enough of those profits getting lost, and are slowly raising their prices, not because they're costs are jumping, but because they are trying to find that perfect place where what they charge is exactly what the right number of people are willing to pay - maximizing their profit.
But getting this right means being willing to listen to the market and figure out whether those saying it's too much are merely the vocal minority, or if you have a real problem. If they are merely the minority, you should still be polite, especially when selling low run figures (every sale counts), and being polite doesn't cost you anything. Don't get defensive, don't get argumentative - these things do you no good. And if it turns out that it's not just a minority, you need to rethink what you're doing, or you could end up with a lot of figures you lose money on.