I still feel that LTL is a good business, but the barriers to entry to do it right are much higher than they are for simply truckload service.
Martineav is right in that you have to be consistent in where you are. Truckload works better that way too but the cost of sale of truckload is far lower (you only need to sell space once each direction for TL, you'd probably be selling on average 6-8 times to fill and LTL trailer. You'll also find you need a seperate P&D fleet at your home terminal to gather and/or deliver freight effectively. As a general rule, if the standard for service is 500 miles per day on a truckload, it's 350 miles per day on LTL ... some longer lanes a bit faster, some shorter odd lanes longer.
It used to easier to sell skid-lot LTL a while ago when freight for the most part was managed at the facility level. But now with larger companies centralizing and using TMS software, it's harder to sell shipper direct because the TMS systems on LTL routing are all geared towards tariff-based LTL and the algorithms to transfer to LTL don't make sense a lot of the time when doing skid rates. Also, tariff based LTL carrier service now is arguably better than what it used to be.
If you do it right, it's good business. But the promise of easy money ... it isn't there any more.