Depends on how much Samsy plays.

If he plays once a month or less than yes it is very stupid, if he plays three or more times a month then it is a worthy investment.

For you saying $750 on a real gun > paint marker you are wrong because how much exercise do you regularly get while holding your real gun? Hunting once or twice a year and the work it takes to go from car to gun range?

With a paintball gun you are running through towns, squatting and participating in a very physical activity every time you take it out to play.