Well, as a seller, you have the choice to reveal your reserve price or not. Some sellers will reveal their reserve prices thinking that if they don't, potential bidders who ask will then choose not to bid if they don't get an answer.
Some sellers don't reveal their reserve prices because to them, if someone wants your item bad enough they will bid anyway and thus keep the auction competetive which is always good for the seller.
Personally, it depends on the mood I'm in. LOL! I used to never reveal my reserve but lately I've been revealing my reserve prices to everyone who asks and I've found that most of the time those who ask don't even bid. I lean towards thinking that it's in a seller's best interest not to reveal the reserve price. If you want the item, then bid on it. A buyer should KNOW how much they want to spend. So bid. And if you don't reach my reserve with your maximum bid, then move on. Their bidding helps ME as a seller. It lets other potential bidders know they they have competition for my item. More competition = more bids. More bids = potentially more money for my item.