If people get bored, that's your fault, not theirs. Greg Wilson wrote that they (audience) should feel cheated if you left early. You're job is to entertain them, which is the opposite of boredom. I think 4 or 5 is too little to be honest. Yeah they say "only three and you're good" but what if people ask for more? You're screwed.
Get a set of about 8-11 that you can do no problem, anytime, very consistently in execution. Then have a few "special" ones you bust out for big events, like birthday parties or corporate events.
Even if you do just 4 or 5 tricks, make them the best you can possibly do. The last thing you want to do is bore them with your magic. If they are not into it from the start, well that's a different story and you're not to blame, some people just suck the life out of things. However, boring someone is definitely on you.
Some food for thought.
Jacob