[jbrennen]

One idea, although probably of limited importance at 0.25/0.50, is that I'd prefer that my opponent believe that I'm incapable of folding a made 7 in a heads up hand. If he knows I can make that laydown, he may use that against me.

Your call on 6th street basically screamed out that you had a made 7-6, and so a fold on 7th street tells your opponent that you're capable of making that laydown.

For this reason, even if it might be slightly -EV to call in situations like this, I'll generally do it in situations like this where the strength of my hand is clearly evident.