I have no idea why your bail was set that way. Magistrates typically follow a bond schedule unless the filing agency makes another recommendation. Only an attorney who has reviewed the state's evidence against you can give you an idea of the strength of your case. Most defense attorneys offer free consultations. I would meet with a few to discuss your case.
Macy Jaggers's answer to a legal question on Avvo does not establish an attorney-client relationship. Please consult an attorney who practices criminal law in your jurisdiction for the most accurate legal advice.
I am in agreement that the Magistrate usually follows a bond schedule. It is also not uncommon for a judge to increase a bond occasionally. You need to hire a competent DWI lawyer in your area.
The information provided is not advice but a legal perspective and you should schedule a consultation with the lawyer of your choice.
I agree with the previous attorneys as far as the magistrate setting the bond. The more important worry for you should be the future of the charges against you. I recommend that you meet with an experienced DWI attorney as soon as possible to get a better perspective on the charges against you. Remember that you only have 15 days to request a hearing on your drivers license.
I agree with the answers stated by the other attorneys. I recommend you consult with a qualified criminal defense attorney who is knowledgable in alcohol related offenses.