Those who purposely go out to get some excitement are usually those who are bored with their lives. Bungee-jumping is a predominantly western invention and the participants are usually bored westerners who would do anything for some excitement. It needs a certain amount of guts to be able to jump off a bridge only to be saved from certain death by a piece of rubber cord failed and the thrill-seekers perished. Yet the others persist. I suspect these others are not only bored with their lives, they could be unconsciously looking to either end their boredom or their lives. In short they could have suicidal tendencies. Would people bent on killing themselves be called foolish?
Rock-climbers and sky-divers also take enormous risks. Deaths resulting from accidents are not uncommon, but people continue to do them. I asked a friend who does rock-climbing why he pursued such a dangerous sport. He said every time he reached the top of a rock, the feeling of excitement and achievement was quite incomparable. It is intoxicating and he is hooked by it. So he seeks to repeat the high, despite the obvious risks.
I suppose the exciting feeling holds true for the other unpaid dangerous sports as well. They get the adrenalin flowing through the blood. These excitement-seekers are obviously addicted to it. The only thing they get out of their pursuits is excitement, which has to be repeated. No other gain is forthcoming except some respect from others. Perhaps respect is also an excitement thing for some.
The professionals who take great risks are far better off than the amateur ones in terms of financial rewards. Race-drivers are usually millionaires. So are boxers. Also these professionals are well covered by insurance and they do not take unnecessary risks. In fact they are very careful indeed in their work.
In conclusion, I would say that amateurs who look only for excitement and danger are foolish because they stand to gain nothing and to lose everything. They are putting their heads on chopping block for the sheer thrill of it. The professionals are different. They get paid and make sure that their necks are well padded. Thus they are not as foolish, not by a long shot.