It is worth more these days, but that is because people searching for [bingo card creator] are probably looking for Bingo Card Creator (for example, with five seconds of checking into my stats, I can guarantee at least 30% of folks searching for it last week and clicking on my site already have an account with me).
(Have I mentioned that "Google owns navigation on the Internet"?)
On a related note, I'd be very happy to pay you for an SEO consultation.
"Organic searches with the word 'bingo card' makes up ___ percent of my sales."
As you say, tho-- might be hard to parse out brand searches. But every single one of your holiday-specific landing pages benefits from "bingo card" being in your URL. Isn't long tail SEO a big part of your acquisition?