Should you always call with an edge?

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I was recently in a HU HE tourny, and at the early stages picked up A [img]/images/graemlins/heart.gif[/img]4 [img]/images/graemlins/heart.gif[/img] and raised it up. My opp called and the flop came down 4 [img]/images/graemlins/club.gif[/img]7 [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/heart.gif[/img]
My opp bet all-in on me. About T1400 into a T200 pot. I know he has top pair, and doubt he has an ace. (It turns out I was right) Knowing that; is it correct to call, beacuse I have 15 outs w/ 2 cards to come? I figure I'm about 55-45 favorite. I'm a slight favorite, and I'm getting slightly better than 1-1 on my call, so Math says I should call, but it doesn't feel right. To much risk on a draw perhaps, or maybe just not enough invested in the pot.

I was wondering, what is the correct move here? Does the players relative skills factor in here? Should weaker players call, and stonger players wait for better odds? Or does taking the edge, however small, make some players better?