Is It A Good Idea To Join Many Affiliate Programs?

Is it a good idea to join many different affiliate programs at the same time or is it better to concentrate on a few at a time? This is fairly common question that is asked by new affiliates who really get excited when they discover the possibilities available in affiliate programs. However, one needs to be cautious. There is of course nothing wrong with joining numerous affiliate programs at the same time. But the big question is; will you be able to market them effectively.