WHAT HAS LUCK GOT TO DO WITH IT?

It is simply good manners to say to your opponent "good luck" before you start the game. Not difficult at all to understand it's meaning.

Good luck is two nice words, nothing more, nothing less. I often state something more precise, like "I wish us an interesting game" It is nice to wish your opponent good luck. Those luckwishers are polite and fine people.
Speaking about luck. I want that for myself, I want to be so lucky that I get some inaccurate play that I can punish.
It is ok for me that my opponent gets lucky, that I give him or her something they can punish, leading to interesting positions.

I second what Jr Dingle said. It's just good manners. It's the same as shaking hands with the opponent. Good sportsmanship is easy to recognize and appreciate but a social misfit mind find it difficult to understand. And for some, it's more than just a formality, they really mean it. As with any human competition, there is always some luck involved.

I am surprised at the number of chess players who feel they need to wish other players ''good luck'' before the start of a game.I take it most players are entering a game of chess to win, to crush their opponent as quick as possible...then why wish them any thing that is going to make your job harder?
Do players say it because they need to be loved and noticed? Some players take it as an insult implying that without this good luck they can`t win
This has been answered so many times, but its worth repeating again.
The only place wishing someone "good luck" and taking it as something other than good sportmanship, is online. Saying good luck, and good game happens all the time in OTB tournament play. So chalk it up to what it is. The annonymity of being online.

"Good game" is more to the point and way more sincere/realistic in my view , than wishing your opponent " good luck" since a) chess is not a game of chance and b)you don't really mean it. However,it seems it is a convention, even if a highly unfortunate one.

I dont believe theres luck involved in a chess game. it is simply skill, concentration, and the capacity to play, what people believe is luck is just imprecise play from either yourself or your opponent.
Chess is all about luck, and the skills to see the luck and take advantage of it. Look at the computeranalyzes. On our level absolute accurate play in all moves happens in maybe one of 5000 games. One inaccuracie is luck for the opponent. It happens all the time. To punish that inaccuracie is skills. You need luck to use the skills. With no luck (noone playing inaccuracies) the game is a draw.
I am surprised at the number of chess players who feel they need to wish other players ''good luck'' before the start of a game.I take it most players are entering a game of chess to win, to crush their opponent as quick as possible...then why wish them any thing that is going to make your job harder?
Do players say it because they need to be loved and noticed? Some players take it as an insult implying that without this good luck they can`t win