No. I focus on roleplay during a game, I just have an excess of free time and tinkering impulse to spend on learning rules and tweaking them. I've become pretty familiar with the 3E rules and how they are/should be balanced. I DM nearly as often as not, anyway, so game rules are justifiably important to my gaming activities. As a kid I tinkered with LEGOs and sketching, as an adult I tinker with game stuff. But I've always been big on stories. I read entirely too much.

My rules tinkering largely benefits my players moreso than it does me. I've run 3 long campaigns, 2 short campaigns, 1 part of another DM's campaign, and a few short adventures/mini-campaigns, plus several Arena battles in The 13 Kingdoms (with a variety of recurring and one-time gladiators).
My characters are rarely very munchkin (my last PC was Argus, the druid/monk/barbarian/ranger/fighter.... the latter three classes came after his wretched luck drove him to lose faith in his monastery's teachings and become more savage, joining a barbarian tribe; he universally sucked at just about everything the entirety of the campaign; especially alongside the party's frenzied berserker, deepwood sniper, and transmuter, who all rocked). I like to multiclass and focus on fun or interesting concepts, then I try to min-max a bit to make the character still somewhat useful and not entirely dead weight. Not always successful.....
Before Argus came Magnus Krieghelm, a multi-tactic-oriented fighter who died trying in vain to protect his country from a goblin army. Before that, in an earlier mini-campaign, came Theodus Brightbeard, a dwarven bard/fighter aiming for the spellsword PrC, who was ousted from an honorable position as family loremaster and oathmaster by a devious cousin and was exiled into life as an adventurer. Somewhere between these games were my gladiators Corvus Thoracius the hobgoblin rogue/fighter ex-marine and Seruleus the dark elven sorcerer/monk, both of whom generally sucked, but at least Corvus was tenacious and invaluable in saving the team's butt a few times in the Arena.
Before that was my PC Vaeron Dunerunner, a sorcerer/wizard in Emiricol's Bandora homebrew campaign, probably my favorite or second-favorite PC thus far, though like many of mine only modestly effective. Shortly before the Bandora campaign went on indefinite hiatus, Emiricol tried a brief Forgotten Realms mini-campaign, in which I played an Earth Genasi fighter/ranger whose few magic items and NPC contacts each had at least a paragraph of background. My D&D PCs before that are numerous and short-lived, since before that I was only able to game with friends who were really flaky about DMing. I've played a few other D&D and Shadowrun characters with likewise short lives but background as extensive as my Earth Genasi's (his darn name eludes my poor memory at the moment; that game only ran a few sessions before Emiricol decided to abandon that and return to other campaigns).