I think you should do what you feel is more condusive to your own career.
If you feel obtaining an agent would help further your chances of getting booked, which via the monster called networking may help.
Then so be it.
At the end of the day your releases serve as a promotional tool to your dj career in some instances.
But if you truly feel you have the talent and the chops to hang with the big boys then I see no reason to hold yourself back and not obtain a booking agent.