Why? I don't see anything wrong with toy play. For me Transformers as a hobby is a form of escapism - and I like to get lost in the fantasy. What's the point of having all this rich and diverse lore and mythos if I can't dabble in it with my toys? It also allows me to exercise my imagination and creativy.

So I don't think playing with your toys is necessarily a sign of stupidity; to the contrary I think that creativity and imagination are signs of intelligence.

"The true sign of intelligence is not knowledge but imagination."
"Logic will get you from A to B. Imagination will take you everywhere."
"Imagination...is more important than knowledge. Knowledge is limited. Imagination encircles the world."
- Albert Einstein

"We don't stop playing because we grow old; we grow old because we stop playing."
- George Bernard Shaw

"If you aren't playing well, the game isn't as much fun. When that happens I tell myself just to go out and play as I did when I was a kid."
- Thomas J Watson Sr.

"Creativity is the sudden cessation of stupidity."
- Edwin Land

I'm proud to be a Player.

Playing with Transformers as a child in the 1980s
pew pew pew

Playing with Transformers as a graduate student at UNSW's Keith Burrows Theatre
Pew Pew Pew!

Playing with Transformers at Pizza Hut with Roller last year
PEW PEW PEW!!

References
Creativity
Imagination
Play: "Modern research in the field of 'affective neuroscience' has uncovered important links between role playing and neurogenesis in the brain."
Childish vs. Childlike