Yeah-it's what we're doing these days. Most of the venues we are playing, we are providing sound and we're not quite at the point where it makes $ sense to bring in a separate sound man. As it is, I build the instruments, write the songs, book and promote the shows, and take most the money...I'm not quite ready (I should say my family's not ready) to take a smaller cut...
Also, I'm starting to integrate all these MIDI triggers and midi->DMX lighting effects that are triggered right off the stage computer so we are going more and more to a fully contained unit (at least for our crowds of 100-150). As we get larger crowds, the next step will be to bring along our own engineer, but even then probably using most of our own gear until we get to a point where we can hire out the production...(and franchise!...wait did I say that out loud?!?)
Up till now, we have gotten by with no monitors which is just fine, but now with these electronic elements, we are using some cues from the comp for changes so at minimum I and the drummer need to know what's coming next.