You still get a portion though, no? I've been mining for three days on and off. I've solved nearly 50,000 shares for this block -_-
As long as they don't switch to PPLNS before the round ends, you will get your share. Once they switch to PPLNS, it will be important that you are mining with them at a consistent rate all of the time in order to insure you get your share, however, those who do that will do better per block than they do now, and pool hoppers will be discouraged from using the pool, making it more stable and supposively more fair.
EDIT: Presumably you only mine at night. In that case, your best bet is probably to look for a SMPPS pool. With those, you get paid a set amount per share. The pool keeps the excess when a block is found fast and uses it to pay the difference when a block is found slow. Presumably TripleMining is small enough to consider that (SMPPS) risky for them to implement.
Disclaimer: Everything following the word "EDIT:" above is based 100% on my personal assumption.