it drove me crazy when i first joined RHP. you'd be down to one forced move. nothing complicated. the king is in check. he moves it and you mate. what's he do? of course. he sits and lets the clock run down.
that's how they play, the non-subs. you only get six games, so you resign, knowing you really won. he wins the rating points.
after subscribing, that concerned me less. then i went crazy over those who took on way too many games. after raging against the worst offenders i figured out a strategy for dealing with it. i joined too many tournaments, too many clans, and made too many challenges. it's very cool - and i've never been timed out on a game, and never had a skull appear.