if you are sharp and/or shopping dilligently, then the line will almost NEVER move in your favour.
i have a friend who had this happen to him consistently at a few books. he felt that he was being used
as an unpaid line service as they would move the number on air not accepting any (or very, very few) bets
from him at the original desirable price. he was NOT betting steam. he called up both books and talked to
the sportsbook managers. he said if they didn't want his action, he would leave as he didn't want to waste
his or their time. at BOOK A, they agreed to accept all of his bets at a very low limit and all bets above that would have
to be called in and subject to line revisions. not the best solution, but fair. at least he was compensated
as their line service. at BOOK B, they said on thinly traded sports or markets they couldn't help much.
on more active markets where they could generate cross action by moving a number, they would try to
accept his bets. so, if you are having this happen to you, call the sportsbook/line manager and talk to them
nicely. maybe you will get some resolution to your problem. hope this helps..