With the disposable income males at those ages have, I'd wager they certainly do buy toys. Lots of them.

I realize this is only anecdata but the ones I know buy EVERY ONE of the toys :)

Bronies do buy toys - in fact, they complain that shop keepers don't take them seriously and/or assume it's for a younger female sibling.

co-worker of mine used to buy a lot of toys and other merchandise (pajamas?!). He fit into that age category.