The sports ports of Ibiza just don't have enough room with only 2400 moorings. The increase in the number of boat owners coupled with the increased demand to moor boats on the island has left a shortfall of at least 1200 places.
The number of mooring places has not increased for 12 years but things may be about to change as plans have been released by the authorities which would make possible several new sports ports up and down the island. So watch this space.