Spotted by forum member @Sarin.
Advancement past Sindikat Member does not appear to be possible by buying illegal goods.
"OnGlobalPlayerBoughtItem" in 'unidBlackMarketMember' has a limit in the code, 'maxXP'.
(block ( (maxXP 1500) ) (switch ; If the player bought illegal items from the Black Market then ; we add to XP. (and (objHasAttribute aSellerObj 'blackMarket) (itmMatches gItem ([email protected] gType 'smugglingCriteria)) (ls ([email protected] gType 'xp) maxXP) ) ...
Advancing to Sindikat Member sets the type property "'xp" to 1500 so this code does not run.
Possibly successful BM missions could generate enough xp to rise to Lieutenant (3000xp) but I can't see how Lord (10000xp) could ever be reached.