The logic behind this is that not all the ventures will end in losses. But as the old adage says when you grasp all you just might lose all. Enticing though they might be, multiple ventures will only cost you more money [licenses, start up costs, employee salaries, etc] which can be put to better uses, marketing for example. If you are interested in starting several businesses, it's advisable to start one and give it all your attention. Once it starts making profits, use a percentage of the profits earned to start a second business. Rinse and repeat. This would minimize the losses you'll make.