It has been one of the most popular common subjects in these threads for a long time, ggl.
Unfortunately, WGT has mo means to administer a fair and equitable punishment, as they have no means of determining the reasons for a dropped game or dropped player. These are some of the same arguments in conjunction with the reputation feature, and the new tier level changes that are in the works. Would not be fair to punish someone for a power outage, isp outage, etc.
The only fair way to handle this is to force everyone to finish each and every ranked round. If a round counts towards a players average, it should be finished. The game currently re-launches with the game saved, and gives the player an option to resume, or quit. Removing the 'quit/end round' option would take care of this fairly. It would also make it easier to identify sandbaggers, as a dropped low scoring round simply disappears right now. Under this format, a player that has a great start would have to purposely shoot bad on the ending holes to keep their average up, and prevent moving to a new tier. Easy one to spot, if it is programmed correctly.
It is important to understand that punishing someone by elevating their average just might REWARD them for quitting, as many are quitting to artificially elevate their averages (by not posting low scores) in order to prevent a move upwards in tiers.