Funny thing about Exploration, Not many people do it as a serious profession. People just don't want to spend the time looking at a map and moving probes for hours. Some people think that probing in high sec isn't very useful, but in fact its the exact opposite. Probing in high sec can easily be one of the easiest ways to make money. I've ranged on average something like 20 mill an hour, sometimes more just from high sec.

Hacking sites (Radar) are always worth doing, I have always gotten at least 5 mill off a single site, and upwards of 20 mill. But the big money is in deadspace complexes. Out of the ones I have done, I average about 50 mill a site. Most of the sites I have found in High Sec can be done in a cruiser that is purely fitted for exploration. Only once did I need to grab a battlecruiser to complete an expedition, which netted about 50 mill for the entire thing.

Archeology and Salvaging sites are almost not even worth doing in High Sec. They barely give any money, you just have to get lucky and hope you get something worth more than 100k.

On the contrary, Hacking in wormhole space tends to be a bit pathetic, the sleepers that guard the place are usually worth more than the hacking site itself. Archeology is where the money is in Wormholes, besides asteroid belts. You can usually net a ton of money, sometimes pull 50+ mill out of a single site.

Exploration is the thing I love to do the most in EVE, It doesn't require a whole lot of skills, but if done properly, and with a bit of luck you can make hundreds of millions of isk in a week without a whole lot of effort.