Why do you think this??
- we can't have KK (raise pre), K9 (fold pre), 33 (fold on flop), so if has those he must be sure that it is nuts
- and we are probably fold FD or TT, etc. on the turn to "normal" size bet, but it's so hard to fold K or 9 here, so I think it is good to value bet big, if we are villain