TPAP quiz number #27 question

[Geng]

As they say on the WPT, "hold'em, a minute to learn but a lifetime to master." I've still got a long way to go in the learning and am confused with hand quiz #27 with AK [img]/images/graemlins/heart.gif[/img] and why you wouldn't want a raiser. Is the expectation that after all the early betting you're up against a set or 2 pair since there isn't a straight draw on the board? With all the people calling with worse hands these days has that thought changed?

Thanks,
Geng