I seriously collect Dragonball figures, and I can assure you that that set is not worth $75 dollars. Toywiz always seems to have the most ridiculous prices - I really don't understand why, and I shudder to think that people are actually shelling out that much for mini figure sets that common. That set incidentally, is an American Irwin Toys re-release of much older figures from the French company AB. I don't think even in the original AB packaging, would that set set you back $75.
Mini figures are often times the most rare, so yes, there are sets (AB and others) that I'm sure a collector that needs the figures would pay that kind of amount for.... I've never made it my business to criticizes the way other fans choose to spend their money - all I know is if you want something in your collection bad enough, of course you'll do it! You got to be smart though, and quite frank there are few Dragonball figures in the world that are really worth that kind of money... Especially American figures.
Ebay is your best bet... I just saw this very set up for around 10 dollars on there just the other day.
Unfortunately the AB section of the site is not yet up, but if you want to learn more about Irwin toys and all the figures that they released before making their own, some of that info is now up here :
http://www.supersaiyantoys.com/
All the best,
Oldphan