Bulking then cutting is a dreadful idea, and is only a short term strategy used by bodybuilders (in fact, most top level BBers dont even do it anymore).
Bulking requires a 'shotgun' approach to nutrition, where, rather than give the body specificaly what it needs, you just throw energy into it and hope that some of it 'sticks' as muscle. In the meantime, you just get fat.
Cutting is merely the process of undoing the damage you have done by bulking. During this process, you not only remove the excess fat, but also catabolise a fair percentage of the muscle that is buried underneath it.
Net result: you end up weaker and with a slow metabolism, and with no further muscle growth than if you had done things properly in the first place.
Hey, you asked.Agreed; not worth it. Remember, bulking up fast may see you gaining unwanted fat and we all know that it is easier to put fat on then it is to take off. You want to way more then you have to do it gradual by gaining muscle, eating right, resting properly, drinking adequate amounts of water; doing it right.