ACFT DSNDS BELOW CLASS B AIRSPACE DURING A VISUAL APCH; WHILE ANOTHER ACFT DSNDS BELOW 8000 FT BEFORE THEY WERE PAST SANND INTXN.

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AT 8000 FT DOWNWIND; CLRED FOR VISUAL APCH TO RWY 17. APCH TO RWY 17 HAS 6000 FT ALT ON IT; ALL OTHERS HAVE STEP DOWN ALTS. WE DSNDED TO 6000 FT OUTSIDE OF 13 DME; PUTTING US BELOW THE FLOOR OF THE TCA UNTIL WE GOT CLOSER TO THE FIELD. MAYBE THE RWY 17 ILS PLATE SHOULD HAVE SOME STEP DOWN ALTS LIKE THE OTHER APCHS TO HELP KEEP US IN THE CLASS B AIRSPACE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS POSITIVE THAT ONCE IN CLASS B AIRSPACE; IT WAS NOT POSSIBLE TO LEGALLY LEAVE AND ENTER IT AT WILL EVEN THOUGH HE WAS FLYING A VISUAL APCH. HE WAS INFORMED THAT WHEN ON A VISUAL CLRNC; ALTS WERE UP TO HIS DISCRETION; HOWEVER HE WOULD HAVE TO COMPLY WITH THE SPD RESTR FOR FLYING BELOW ANY CLASS B AIRSPACE. THE OTHER ACFT SIMPLY DSNDED TO A LOWER ALT WITHOUT CLRNC. THAT FLC FEELS STRONGLY THEY WERE FOLLOWING THE INSTRUCTIONS OF THE CTLR; THAT THE CTLR IS THE ONE WHO MADE AN ERROR IN COMMANDING THE LOWER ALT. THEY KNEW THEY WERE NOT TO BE AT THE LOWER ALT BUT WERE CERTAIN THE CTLR WANTED THEM THERE. THEY WERE VFR AT THE TIME AND FELT THERE WAS NO HAZARD.