People take these for fun, but most of them never do it again. The experience is certainly not recreational, but it's like asking people, "if you could live a nightmare in real life, would you?" Some will say yes.
Most deliriants are cheap and fully legal. They include diphenhydramine (Benadryl), dimenhydrinate (Gravol), datura (jimson weed) and amanita muscaria (fly agaric mushroom).