I can't believe that folks don't mix sets together into a huge bin of Legos. The entire point of Legos is to build bigger and better things.
My kids love them now (6 year old twins, 13 year old) and I love 'em.
The only thing I have from when I was a kid is a tiny red storage box...late 70's or early 80's.
Legos are $$$$ new, but hand-me-downs and parents dumping stuff at garage sales = affordable.