All souvenirs seem silly to *someone*!
And playing with a wand doesn't (shouldn't) involve the same sort of things as, say, a lightsaber or sword. It's just waving it around and saying things. So unless it's dropped, it's not in danger from acting like it's a wizard's wand. (obviously my son and husband both "play" with theirs)
We used our AP discount so they were under $20, it's just about all they wanted at Universal, so why not?
Now, if DH wanted Lucius's cane/wand*, then we'd have to talk more about it, since that's $100... But it's seriously stinkin' cool.
The only thing that bothered me was that both kids (even my Gryffindor-loving one) wanted dark wizards' wands -- they just felt 'right' to them.
I'm not one that wants a wand (my weird collecting thing is keychains, some of which I won't use for any key-involving purpose, they are just to own), but if someone MADE me get a wand, it would be Narcissa's. And hers is slightly disturbing. (and when you catch a glimpse of Lucius's and realize that they are similar, you get a little glimpse into their relationship that I'm not sure I wanted!)
*the wand is inside the cane, the cane is very tall, the whole thing is extremely cool, and is kept behind the counters so you have to ask to see it.