Yes, it is necessary to have about 12-15 perfectly mastered effects broken into 3-4 routines. You never want to stay at a table for longer than 3-4 effects. I stay longer if they continue to tip me. Now as for Paddy, the "No Gimmick God", he has a point, however, as stated by cardshark13, gimmicks have their place in magic. Magicians have historically relied on gaffs, splits, double backs, double faces, TTs, and other gimmicks. Those who heavily rely on gimmicks and gimmicks only may encounter problems. I wouldn't put it as dogmatic as Paddy does (NO GIMMICKS), but then of course he is dogmatic about everything. My point is that a good gimmick if presented correctly and often combined with a sleight, is quite moving and makes for good magic. Only your audience is the judge of what is good or bad magic. The power to be entertained lies execlusively with your spectators.
good old paddy, you either love him, or hate him. please no resonses with your opinions. lol. he does have points in the fact that you should be very proficient in sleights before you even think about performing professionally. you need to be able to do magic upon moments notice if need be, and can not 'always' rely on gimmicks. however i agree that some gimmicks out there are just magnificient, and i will use both gimmicks, and sleights combined to obtain the maximum results possible.