RWY INCURSION BY A CPR JET WITH AN RV-4 EXPERIMENTAL ACFT ON SHORT FINAL AT A NON TWRED ARPT; LGU; UT.

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LAST SATURDAY; AROUND XA30; I WAS FLYING UP TO LGU AND SAW A RWY INCURSION FROM A JET IDENTING THEMSELVES AS ACFT X; CITATION JET. I HAD JUST FINISHED MY CALL 'ON FINAL FOR RWY 35 LOGAN FULL STOP;' WHEN THEY REPLIED 'ACFT X CITATION JET TAKING RWY FOR TKOF.' I REPEATED MY CALL THAT I WAS ON SHORT FINAL AND TO HOLD POS. THEY REPLIED WITH THE SAME; 'ACFT X CITATION JET TAKING RWY FOR TKOF' -- THEN IMMEDIATELY ROLLED ONTO THE RWY AND TOOK OFF. I WAS LESS THAN 1/4 MI OFF THE END OF THE RWY CLRLY IN SIGHT. I WOULD HAVE LANDED IN LESS THAN 10 SECONDS IF THEY WOULD HAVE WAITED. I DID A GAR TO ENSURE NO TURB FROM JETWASH OR VORTICES ON THE RWY. ONCE ON THE GND; I TALKED WITH A COUPLE OF LCL PLTS WHO SAID THAT ACFT X JETS DO THAT ALL THE TIME. ONE GUY SAID; 'THEY THINK THEY ARE MORE IMPORTANT THAN THE REST OF US.' THESE LCL PLTS WERE STUDENT PLTS FLYING OUT OF LOGAN. SO IT SEEMS THIS WASN'T JUST A ONE TIME MISTAKE. THEY SEEM TO HAVE VIOLATED THE FOLLOWING FAR'S. 1) RIGHT-OF-WAY. I WAS ON SHORT FINAL. 2) RWY INCURSION. I'M CONCERNED THAT THESE GUYS WILL CAUSE AN ACCIDENT WITH THIS DISREGARD FOR THE RIGHT-OF-WAY AND TAXIING ONTO AN ACTIVE RWY. IF A STUDENT PLT IN A C152 WERE TO LAND THAT CLOSE BEHIND A CITATION JET THE VORTICES AND JETWASH WOULD CAUSE THEM TO LOSE CTL. AT ANY RATE; RWY INCURSIONS ARE A PROB RIGHT NOW AND HOPE THESE GUYS WILL LEARN WHEN TO TAXI ONTO AN ACTIVE RWY AND WHEN TO HOLD SHORT. ALSO THE STUDENT PLTS ARE SEEING EXPERIENCED PLTS DO THIS ALL THE TIME SO MAYBE THEY CAN DO THIS ONCE IN A WHILE AS WELL.