Coin matches and hiding... I can't imagine those mixing. Coins are like blood, you have to collect as much of your enemies' guts as you can. What good will being far away from your bloody enemies do? Unless, of course, you already have more than an enemy has.
Fleeing is a tactic. It's fairly lame, sure, but if I were in a time tournament and got ahead by a KO with half a minute on the clock, you bet I'd do it if it meant I'd win. But in a fight for fun, fight! It's fun!
In response to Turtlekid's 2. I don't know about Brawl, but in Melee, if both players die at the exact same moment in stock and it's the last life of both, they do go into sudden death. If both die simultaneously in sudden death, Player 1 (or whoever is closest) wins. You can achieve this on Icicle Mountain, standing on a flat platform and waiting for the scrolling to munch on your feet. The same could be achieved at Rumble Falls in Brawl, but I haven't experimented there yet. So it would sound like there's an advantage to being player 1, but honestly... what are the chances that you and an opponent going to die at the same time in sudden death under normal circumstances?