Yeah, but if you're a daily drinker, you know that at some point, you're going to end up drinking during the experience. Also, taking a high dose and dulling the effects a bit may lead to a stronger experience than taking a mousey dose and rationing some Marlboro Lights, drinking lemonade, ya know? I think Relayer's got it about right above, just to add what I think, you can easily drink straight through a nice acid trip, then binge like a madman after the peak and be set. Also, with mushrooms a little beer can sometimes settle the stomach, but a lot may make it queasy. Mushrooms don't have that stimulant, keep you up all night vibe (typically, though this does happen) usually, so you can just pop some xanax and sleeping pills and fade out of a mushroom dose. And a beer or 3.
You aren't a daily drinker if you can't wait 6-8 hours for your mushroom trip to be over before you start drinking, you're an alcoholic. You'd have a stronger experience if you just took the higher dose and didn't drink. I fail to see the point of your post.