I can recommend dj'ing if for only one thing... females! If you're going to get into it for the "love of the music," forget about it.
Actually I used to spin a couple college radio stations, after hours (raves, more or less) and in a few clubs in Boston. It's a great hobby, but tough to make any real money in. I've got friends who have made it big in the underground dance music scene, but they all had other means of paying the bills. One was actually a doctor in NY and I bet he'll likely go back to medicine once the ride is over. ^8
If you can, get together with some people who are in the dj'ing/club scene. You'll get a feel for it through them.
I look back at it now as having been an expensive hobby. I've still got a couple pairs of EVs (full range and subs), a beat up board, two out of three 1200s and a few thousand records. I never got heavily into mixing cds. I love vinyl.
It's a tough business and everyone and his cousin wants to be a dj. Research and learn as much as you can before dropping serious dough on equipment.
But again, if you're wanting to get into it for the chics, just max out the credit cards.