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A way of countering this is to have participation points for each event and perhaps having a points booster say after every 10 events. This will reward those loyal to APAT 
Participation points are a very good way of encouraging play - but a very bad way of measuring skill.
I had a thought about national ranking points for league games though.
Instead of points per game - which would horribly skew the rankings to favour online players
The final league table could be awarded national ranking points - as if it"s an additional national championship.
18 points down to 1 for the top 18 in the league:
      (i)   obviously a legitimate measure of skill
      (ii)  encourages extra participation in the league
      (iii)  but doesn"t excessively distort the rankings against the players who don"t play the league
2 leagues per season = 2 extra sets of National Championship ranking points to fight for