This is false. They're just scheduled every other night because ESPN also schedules an avalanche of college basketball /football too. The coverage increases once college football ends, and especially once bowl season is over.
Besides, I said Christmas on ABC. They should show more games weekly on ABC thereafter though.
Now if you want NBATV to show more games, they should (though they give you games on Monday, Tuesday, and Saturday, sometimes Sunday, the other nights, ESPN and TNT show games), so it's not as if they don't show games. They just have a subpar lineup of games other than maybe Fan Night, so most of the games that turn out to be really good don't wind up seen unless you have League Pass.