I looked through namebio, and there were quite a few 'lets...' domains.
And I agree it's maybe not super catchy.
Here's a good one that sounds somewhat similar:
letseatcake.com 1,500 USD 2016-03-01 BuyDomains
Recent sale plus it's even developed.
I'm not sure about this sale:
letsbuydrink.com 325 USD 2015-10-29 GoDaddy
Lol. kinda weird. There might be something important we'd have to know about it.. or it's not legitimate.
Since "Let's eat cake" sounds more natural than "Let's drink beer".. in my opinion.. If you waited long enough, you might just be able to sell it for $xxx. Maybe more if you are patient / stubborn (and not getting only one offer every 10 years :P).
But like johname said, doubt a big company would want to use it.
Maybe a smaller business though - a microbrewery.

Actually, it sounds much better when I think of it as a domain for one of those smaller places. For that, I say low x,xxx with a decent amount of good marketing and luck
