For nearly the entire 20 plus years I've been using Tarot, a good 90% to 99% of my readings have been for myself. I read for myself daily or every other day, though sometimes I go through periods in which I don't read at all -- for days, weeks, more rarely months. Other times I read for myself multiple times in a day.
Mostly I use 3-card spreads, but sometimes larger ones. Recently I've been using a 16-card Function Block Spread from Rose Gwain's Discovering Your Self Through Tarot, once a week or so.
My primary use of Tarot is personal. I don't read to know the future so much as for insight and a look at the energies at work in my life, and for added perspective, guidance, and advice. Tarot's main strength, in my opinion, is to help me get in touch with my unconscious and with the Divine. In some ways it's like journaling or dream interpretation, and in other ways almost a form of interactive prayer. Sometimes I happen to get insight about the future or the day ahead, but I've found readings done deliberately to know the future to be mostly unsatisfactory, so I don't think of my reading as fortunetelling style reading at all, and I certainly don't rely on Tarot for all my answers or decisions, just for added insight.
My readings for others are sporadic, usually for family members, and sometimes in the reading exchange here or for friends. I have thought many times of expanding to read more for others. In fact at one time I was about to start reading for pay, online. But one thing or another has always come up, and I've never felt I was quite ready or had time for that.
I think one reason that I prefer reading for myself is that I prefer slow readings, pondering over the cards for a while without words, letting the images and symbols sink in. This isn't very conducive to reading for others, at least not face to face. I actually prefer online or email when reading for others, for that reason.
ETA When reading for myself, I usually don't ask a question but only ask for what I most need to know now. I also tend to use 3-card spreads with no position meanings -- just build a story or sentence or scene in my mind from the three cards as a group. Since there's no real question, and no request to know my future, I find that fooling myself or not being objective enough isn't really an issue. Besides which, I can be pretty self-critical when needed, as well as self-analyzing, so maybe that helps.
Nevada