BE24 PLT DESCRIBED QUESTIONABLE ATC SVC WHEN OPERATING IN THE DC ADIZ WITH PCT TRACON.

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RECEIVED PERMISSION TO PENETRATE THE DC ADIZ AT THE MAPEL INTXN BY CALLING POTOMAC TRACON (DULLES SECTOR) ON 126.1; LEVEL AT 3500 FT. REQUESTED AND RECEIVED PERMISSION TO PENETRATE CLASS B AIRSPACE AT 3500 FT. AFTER A FEW MINS; WAS HANDED OFF TO 126.75 (ADIZ FREQ) WHEN WE RPTED 'LEVEL AT 3500 FT' AND RECEIVED 'ACKNOWLEDGED' REPLY. AFTER A WHILE; THE CTLR INQUIRED WHY WE WERE IN CLASS B AIRSPACE. WE EXPLAINED WE RECEIVED PERMISSION TO DO SO FROM THE PREVIOUS CTLR. THE CTLR'S REPLY WAS 'THAT WAS NOT PASSED ON TO ME; YOU NEED TO REMAIN CLR OF CLASS B AIRSPACE.' WE IMMEDIATELY DSNDED AND CONTINUED OUR FLT TO EASTON; MD (ESN) AT 1400 FT; ENCOUNTERING NUMEROUS ACFT AT FORT MEADE AND SUBURBAN ARPT TFC PATTERNS; AS WELL AS LEE ARPT. ALSO; ENCOUNTERED NUMEROUS ACFT AT OPPOSITE HDGS VFR AND EVASIVE ACTIONS HAD TO BE TAKEN. THE ADIZ PENETRATION FLT PLAN FOR THE FLT FROM FREDERICK; MD (FDK) TO EASTON; MD (ESN) HAD IN THE REMARKS SECTION 'WILL ASK FOR PERMISSION TO PENETRATE CLASS B AIRSPACE;' SO ATC KNEW OUR INTENTIONS. WHILE FLYING AT 1400 FT; SEVERAL ATTEMPTS WERE MADE AT 128.7 TO OBTAIN PERMISSION TO ENTER CLASS B AIRSPACE. AFTER 15 MINS; WE INQUIRED WHEN WE MIGHT RECEIVE CLRNC. WE WERE TOLD '...IN 30 MINS OR LONGER....' AT THAT POINT WE CONTINUED OUR FLT AT 1400 FT; RETURNING TO THE ADIZ FREQ OF 126.75. PLEASE NOTE; IN THE WKS BEFORE THIS INCIDENT; ON 2 OCCASIONS; RADIO CALLS ON 125.52 AND ON 128.7 TO PENETRATE THE ADIZ HAVE GONE UNANSWERED. ON ONE OCCASION; THE FLT WAS TERMINATED AND WE RETURNED TO FREDERICK; MD. BOTH FREQS ARE FOR THE BALTIMORE SECTOR. THE PROB SEEMS THAT BALTIMORE CLASS B ATC CTLRS ARE REFUSING TO HANDLE VFR ACFT THAT WISH TO PENETRATE THE ADIZ OR THAT HAVE ALREADY DONE SO THROUGH OTHER SECTORS; LIKE DULLES. TO FORCE ME AND MY FAMILY TO 1400 FT OVER CONGESTED AREAS; ALL THE WHILE WHEN A COMPLETELY FUNCTIONAL RADAR SYS EXISTS AND IS STAFFED; DEFIES LOGIC. WHY ARE THE CTLRS DOING THIS? IS IT RELATED TO 'WORK TO RULES' IN THE ONGOING CONTRACT NEGOTIATIONS WITH THE FAA? WHY IS MY SAFETY BEING COMPROMISED? I DID EVERYTHING BY THE BOOK. A 45 MIN FLT BECAME A 1 1/2 HR ORDEAL. THE ATC SYS IS BROKEN.