PA 23 ABORTS TKOF FROM RWY 23 AT SPA WHEN A LEARJET ROLLS OPPOSITE DIRECTION OF RWY 5.

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MY COPLT AND I SELF-ANNOUNCED ON CTAF THAT WE WERE TAXIING TO RWY 23 (WINDS WERE 220 DEGS AT 8 KTS). WE THEN TAXIED TO THE END OF RWY 23 FOR RUN-UP CHKS. WE SAW A LEAR JET TAXIING TO RWY 5; BUT HEARD NO RADIO XMISSIONS FROM HIM. WE DISCUSSED THAT HE WAS PROBABLY TALKING TO GREER APCH FOR AN IFR CLRNC; BUT WOULD SURELY SELF-ANNOUNCE BEFORE TAKING THE RWY. WE SELF-ANNOUNCED THAT WE WERE TAKING RWY 23 FOR IMMEDIATE DEP; THEN TAXIED INTO POS. WE SET AND CHKED PWR THEN RELEASED BRAKES. APPROX 5 SECONDS LATER WE HEARD 'LEAR????? DEPARTING RWY 5.' WE IMMEDIATELY CLOSED THE THROTTLES AND TOOK EVASIVE MANEUVERS TO THE R SIDE OF THE RWY AND APPLIED BRAKES HEAVILY. MY COPLT XMITTED 'AZTEC ABORTING ON RWY 23 SPARTANBURG BECAUSE WE DON'T KNOW WHAT THE LEAR IS DOING.' THERE IS A CREST IN THE RWY; SO WE COULD NOT SEE THE ACFT UNTIL WE HAD TRAVELED ABOUT 1000 FT DOWN THE RWY. WE THEN SAW HIM ROTATE AND BANK HARD R WHERE HE AVOIDED US BY ABOUT 30 FT. WE TAXIED CLR AND TAXIED BACK TO RWY 23 FOR ANOTHER TKOF. THE LEAR NEVER MADE ANOTHER XMISSION. AFTER TALKING TO THE FBO 1 HR LATER; WE LEARNED THAT THE LEAR PLT SEEMED 'IN A HUGE HURRY.' THE PROB WAS CAUSED BY A 'PROFESSIONAL PLT' NOT FOLLOWING BASIC NON-TWRED ARPT PROCS SPECIFIED IN THE FAR AIM AND CONSTANTLY EMPHASIZED BY MANY SAFETY ORGANIZATIONS. HE FAILED TO USE THE PROPER RWY FOR CURRENT WIND CONDITIONS AND FAILED TO MAKE ANY OF THE RECOMMENDED ANNOUNCEMENTS ON CTAF. EITHER OF THESE WOULD HAVE 'BROKEN THE CHAIN' OF EVENTS LEADING UP TO A POSSIBLE TRAGEDY.