Charlie Maxwell,
1st hand experience. When Al (R.I.P.) was there, sometimes I would move a line, then it would immediately be moved back. I would do it again, same result. This was not a technical glitch. They didn't want me tipping off there plays. It must be noted that this was in 1995 or so.
I don't know about today, but when Shark (professional handficapper/gambler) and Bill (gambler) were there with Al (Professional gambler, last man entered into Las Vegas' "black book" right after Tony Spilotro) they ran Don Best basically as a cover for their gambling activities. I don't think it was untill the college educated, internet savvy Dana took over, and offshores started taking off, that the true potential of Don Best was realized.