Re: who else keeps everything to 10 except maybe volume?
depending on what the amp is, there is alot of validity to what our canadian bro said. on most amps the eq causes a serious drop in level 30 dB or more in blackface/silverface fender type amps for example. i often run the controls as high as possible, with the bass control being the exception on fender amps, too high and the bottom end gets indistinct which i cant stand.
when i still had my marshalls i did the "marshall roll" and pinned everything. bass, middle, treble, volume all on 10. you have to be a little careful since this can cause some parasitic feedback/noise problems on the older plexis. the presance works in the neg feedback loop so its a little different, in general i dont like presance controls and neg feedback has its place but more times than not i prefer the tone without it.
getting back to the fender thing, i modded my deluxe reverbs normal channel by bypassing the eq and just shelving up the bass so it isnt farty and even though it has only two gain stages vs. the vibrato channels three it sounds way gainier (and fatter and thicker oh my!).
putting the eq full up causes the least amount of loss in most passive circuts, especially those with fewer gain stages before the eq. many of the more modern designs use the tone controls in an interactive manner with the volume so if you have the eq set low and volume high you can still get a cleaner tone while raising the eq significantly will push the gain considerably