Starcraft – Where to see a FULL Day9 casts list that is updated daily

Yes.

You should receive full points. No part of the point calculation or the change to your rating is reflected by anything that happens in game.

On an unrelated note it is considered proper etiquette to say "gg" before leaving in such a manner.

Now I'm sure someone will mention pro-matches in reference to this question. When participating in a tournament with Bo5 style matches (Best of 5 games, or First to 3 wins) experienced tournament players will actually delay a final push when they believe they have 100% chance of victory. The purpose is to cause the losing player to exert additionally mental stress in trying to win an unwinnable game and thus have them "tired" for the next game in the series.

While this behavior is not considered bad manners and is often times a signifier that you are playing against a tournament pro, it leads many professional gamers to bow out earlier than you might normally expect. Because they know they still have to play potentially 4 more games, top players will often quit if their opponent has gained a significant advantage at any point in the game.

The corollary to this behavior is that in a game N situation (or game N-1 if you're losing floor(N/2) to floor(N/2)-1), losing players will often stay longer as defeat implies elimination.

Liquidpedia lists 'current' SC2 Players.
Everyone on those lists are associated with teams that have sponsorship (i.e. get money to finance their gaming).
Bear in mind that SC2 is still relatively new and the professional scene is still developing. A lot of BW players have not yet transitioned, and not counting the beta period, only a few tournaments have been held. Out of these, the only one with a 'professional' prize pool is the ongoing TG GSL, which is giving out ~85k usd to the winner iirc.

Be sure to check the Ro64 GomTV TG GSL brackets list for more info. Not everyone there is a 'professional' SC2 player, but most of them have team sponsorship.

Cheers!