Bail is usually proportional to your crime and there are businesses that will pay your bail if you give them 10%. They take the risk and will send a bounty hunter after you if you skip bail.
Some states like California are testing out non-cash bails which is probably similar to what Germany does. If you do something evil like murder, you stay in jail until your trial. If you're harmless and not looking to escape the country, they let you go.