A humble question

Didn't mean to offend anyone. I read the posts here because I like to get a glimpse about how the game might be if I some day in the future will be able to move up to a higher level. I'm asking because sometimes I see people raise and reraise flop call or bet turn and then fold river. Then I say to myself, couldn't it have been done in a more unexpensive way?
It's still interesting to notice that almost every reply advocates the style I'm questioning. I live and learn.

PS. I've read them all, they usually cover the lower limits, that's why I hang around here.