Screw that. Catacombs is one of the only neutral gold supplies there is. Remove it, fine, but ensure there's something else; something NEUTRAL, before talking of removal. Strip Bar's low, Gambling Bar's too late, and the brothel itself tends to be flaky as hell in terms of income(and that depends if you want to run a 'brothel' sort of business to begin with). It's fine for an evil playthrough as they can set up new buildings, but you'll never have enough customers for a single building even with the standard 20 room, let alone expansion.
WHy should I seek Petty Theft and Grand Theft-why should they and Extortion be the only ways for supplementary income? Can't I run a decently classy joint, like Stringfellow's in Soho Square? Why must all the options destroy your rep? Actually, that's as much a flaw with the Rep system as anything else. There's nothing you can directly do to raise it, and practically everything lowers it.
I'd prefer a split option. Catacombs-Girls, Catacombs-Items, Catacombs-Treasure. Lower the rates of success, but control what you get out as you wish. Could allow a few more missions that don't involves getting new businesses.