why we don't have jumpdrives from the beginning?

[Klaw117]

The best possible way to describe the lack of jump drives is probably to say this: Jump drives require fuel. Jump gates don't. Having jump drives would make flights much more expensive and trade less lucrative due to the need for additional fuel. Having jump gates makes things more efficient since all that extra space that would be needed for fuel can now be converted into cargo space, making trade more profitable. The extra efficiency of jump gates probably led to jump drives becoming obsolete.

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Carlos Rivera: Corsair Brotherhood Pirate - Retired, shifted to Tripoli Shipyard's Research and Development engineering teams
Anthony Cameron: Guild Core Bounty Hunter - Killed in Action, committed suicide after being trapped in Omicron Minor following its destruction
Juan Ruiz: Outcast Ghost of Razgriz Pirate - Killed in Action, killed by the Sirius Coalition Revolutionary Army during Bretonian piracy raid
Michael Winchester: Liberty Security Force Agent - Missing in Action, likely killed during Rheinland espionage mission or trapped in Rheinland Space
Eric McCormick: Order Pilot - Retired, shifted to planetside training of new recruits

Liberty and Nomad Backstory, Very interesting - read it!