You're probably right, Guy. 4 or 5 around a trellis is probably good. That will yield a lot of hops too. I had three at one point and don't have any anymore. It's really hard to dry them and preserve the oils in them properly.
Don't get me wrong, I grow as much of my own food and stuff as I can, but one thing I don't mess around with is compromising the quality of my beer!
I can't grow hops like they can in the Yakima valley, and for $1.50 an ounce, I'll buy the good stuff. Sometimes you just have to pick your battles. Being married, I'm sure you know that!
Not that you can't grow some good stuff, in fact, go for it!
"Knowledge is power. Arm yourself."