Alright, so there are several reasons that we don't use any microphones for our guitars and bass. Here they are:
Too Loud
Having to do with the way the church is set up, amplifiers pretty much blow the faces off the people in the front row, and everyone in the back get little to nothing. Even the PA would be of not help because they'd basically be doing the same thing now (amplifying guitars as main speaker) rather than simply pushing the sound of the guitar further.
This is just an unfortunate aspect of the building that is our church. It's not big enough to constitute the use of guitars cabinets with microphones, and not small enough to simply keep the guitar loud and everyone else at the balanced levels without blowing up the front row of peoples' faces.
Microphone bleed
In front of our guitarists, we have four singers (One lead, three backup). So, of course, a micriphone should only amplify voices, no the guitar in the background.
So, we're stuck between a rock and a hard place. Apparently our bassist has a tube amp direct box that he's been using ($60, he said) which explains why the bass sounds pretty good.
As for us, I was suggested two options: first, like you said, tube amp direct boxes. Apparently our sound guy has had one, so we'll use it for the acoustic. When I suggested using it for the electric guitars, there came another problem. It has been done, but due to the number of effects in the pedal chain, it caused too much noise.
That leaves one option that I thought of that technically would work: Isolation cabinets, or amplifiers mice'd and behind plexi glass. There's a little room just behind the stage we can put it, but now there's a problem with money.
Anyways, first thing I thought of was the Rivera Silent Sister. Thanks for the tip, Mick Thomson. Each one's 1k each, so we're all basically saving up for a REALLY nice amp, one we won't have to replace anytime soon and one that we can speaker out to the seperate room and plug into the iso cab, the plug straight into the PA.
I'm learnig quite a lot from these experiences... This is good.