I'm sure this has been around for a while and I haven't noticed it, but when I was voting for Harry Effron and his hilariously apt and democratically triumphant anti-caption-turned-real-caption, this offer turned up in the thank-you page:
If you can't read printing that small, it says "Purchase this cartoon with the caption you voted on as a matted print for only $49.95 now." So now you can have the caption you were rooting for, and the non-winners can be satisfied that their captions really were the most fitting, forevermore. Nice move, Cartoon Bank!
Update: I see you can also order a cartoon with your own caption. That's probably been around for a while, too. I'm adjusting to working full-time again, folks; this is how things get missed!
If you're curious about how the winning caption evolved for another inspired Drew Dernavich contest cartoon, the exclusive interview is here, and continues right here.