alt Hacker NewsThat about the odds to be killed in a year for a Russian volunteer signing up to go to Ukraine. They do it for just $3k/month - for many Russians it is a great money and thus they risk their lives. Giving the limited options, it may as well be that many gladiators were happy to fight in the arena instead of dying from hunger and exhaustion in say quarry.
Considering many people willingly became gladiators you're pretty on point, it was not only about money, but it was an easy way to gain access to housing, food and other amenities that gladiators were offered between fights and training, not to mention it could also be an alternative to slavery when one fell into debt they couldn't repay.