It really comes down to how much time is available for the tournaments. An extra sled added to the bobsled competition just extends the day by a few minutes. I believe beach volleyball plays a fairly compressed schedule (teams can play every day). An extra team added to the hockey, curling, soccer, etc. usually requires extra days which may not be available.
That and usually the federations in charge prefer to have more countries represented because the majority of countries that have votes in the federation are the ones trying to get a spot in the Olympics, not the teams that are hoping to get additional teams - in hockey countries like Latvia, Austria, Slovenia, etc. are going to vote that the last spots go to more countries, not Canada 2 and USA 2.
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