I can't comment on the costs & how it's handled, as I do not have first hand knowledge. However, I can comment on the facts about a non-LEO vs a citizen.
Anybody remember Eric Rudolph? He was hunted here in the mountains of WNC for months, with hundreds of LEO's & all kinds of expense. While his weapon of choice was a bomb,,, it still only killed one person & wounded a few others if I recall correctly. The efforts to find him were almost a direct reflection on this manhunt. The difference was they DIDN"T catch Eric as quickly & they spent more time & money than this effort. And while Eric was caught by a local LEO,,, the Feds KEPT officers in the area all the years he was wanted.
Irregardless of either case,,,, a lot of how a manhunt is conducted is due to the perceived threat a wanted person is. Eric was considered very dangerous due to his bombing the abortion clinic & then the Olympics. This guy in Pa was considered still very dangerous due to his background where he wanted to wage a war on LEO's.
What about the recent kidnapping of the woman where they had him on video? A lot went into this hunt but due to the fact it was in an urban environment, we as non-LEO's did not get the media blitz of a visible manhunt. And it concluded much quicker.
Often, the media, combined with the circumstances causes a different response than many other cases.
Look at the media & how the case in Ferguson has been handled. Once ANY case catches a major media outlet,,, and if it's not resolved very quickly,,, it will often get blown out of proportion, both in hype & costs.