Matt,
When you are playing with friends that's one thing, but you said "when I play in events I tell guys I'm a 10 handicap". That's outright sandbagging since it sounds like you know your GHIN index would be much lower but you just don't like the way its figured. I sure hope you haven't ever won and accepted prizes based on that fictitious handicap!
This is a great example of why I never play for anything more than a token sum with someone I don't know, unless they are vouched for by someone I really trust. It doesn't have to be actually lying about a handicap or going to the extremes of deliberately missing putts to post higher scores, there are a lot of ways to sandbag.
If someone asks your handicap, why don't you just say "I don't post my scores so I don't have an official handicap, but I usually shoot about an 82". If someone mistakenly infers that you are about a 10 handicap from that, then its their fault and you haven't done anything wrong. But don't get pissed if they decide you are a 5, because if your 82s are at a moderately tough track, that's probably about what you are, according to GHIN, whether you like or agree with it, or not.
Its no surprise you find you "pound" the guys in your office when you play them based on their handicap, if they are a GHIN 10 and you are a Varney 10 they are essentially giving you five shots. You might find the competition you seek if you got yourself an official handicap and played guys (who play by the rules, ball down, etc. as you do) who have a similar handicap. Or if the guys at your office are all GHIN 10s, by giving them the 5 shots they deserve!
I have to say, given how little knowledge of how GHIN really works that even the GCAers in this thread exhibit, whom I would expect to know this stuff pretty well, that one could probably make a lot of money perhaps not quite honestly but definitely not dishonestly. Simply by NOT carrying a real handicap yet being scrupulously honest when asked "what's your handicap" and replying with the exact raw totals of your last 10 scores. I'll bet a lot of people would average them, subtract from 72, and decide that's your handicap. A guy could really clean up that way, and no one could fault him for cheating, at least not by the letter of the law...