There isn't much cost difference between a good wet sump system and a dry sump system. Once you go with a high dollar wet sump pan and a vacuum pump you're in the same range as a dry sump pan and pump. The high end wet sump systems use belt drive external pumps which cost almost as much as a dry sump pump.

Getting rid of the distributor drive is a good thing on a race engine. One less harmonic for the cam drive to deal with. Not to mention, the chatter that it puts into the ignition system. I can hear the difference on the dyno between a BB Mopar that has a normal distributor/oil pump drive vs. a race engine with a belt drive oil pump and a belt driven distributor. The ignition is rock steady when you get rid of that oil pump helix drive system.

One of the biggest benefits of the dry sump system is that you feed the engine bearings with high quality oil. The oil in a wet sump gets beaten into a froth at high engine speeds so you're feeding the bearings a bunch of air. The dry sump tank is designed to deareate the oil so the bearings get high quality oil rather than froth.