Unfortunately, short of joining a no-vacation tournament, this is a reality of the way tournaments are set up here.
My opinion is that the only way to truly address this issue is to add some flexibility to the vacation caps on tournaments (i.e., the ability to set a vacation maximum as oppossed to all-or-none so that people who such as me who worry that they might have something urgent come up would be more inclined to play in them) and to implement additional time controls that would give a little more certainty with respect to the duration of a game as opposed to the duration of each move (X moves in Y days, hourglass timers etc.).
If you set up your own tournament in the mean time you can try to eliminate these types of players from your pool by selecting a relatively fast maximum time-per-move. The maximum active games suggestion is another good one that would give TDs additional control over this type of thing.
Have you ever been in a tournament where all the games in your group are finished except for all the games of just one player, who has played less than 10 moves in all his games and goes on vacation every other day? You then check him out and he has 113 active games. Now on my part I have no problem with how many games people play at once, although in my opinion it doesn't help to improve their chess much, however if it holds back a whole tournament then it 's another matter. One possibility is to include an 'active games restriction' in the conditions for entry into tournaments. Players who prefer to play 200 games at once can then play with players who CHOOSE to play against them. How about it Chess.com Admins? When these Super-Mega-Multi-Tasked players come to their senses like us common mortals who play 10 to 20 or so games concurrently then they can join any tourney they like but until then some tourneys will just be closed for them.They could even turn the tables on average players like me and have tourneys which are only open for people having 100+ or 200+ active games, then no-one will have reason to complain.