as i said it's relative. calling 87o on a A22r flop is gonna lose you a ton of money. But calling 8:h7:h on a A:s9:h2:d could be fine, because you could turn some flush or straight draws and put a ton of pressure later on.
Also vs wide ranges, Ace high does not need to be bluff raised on dry boards. IF the flop is 882 for example, a hand like A5 in a blind vs blind situation is a really easy flop call.
Example: Vs someone raising 50% of starting hands, and cbetting 100% of the time.
http://www.pokerstrategy.com
Board: 8s8h2d
Equity Win Tie
MP2 52.25% 47.53% 4.72% { A5s, A5o }
MP3 47.75% 43.03% 4.72% { 33+, A2s+, K2s+, Q2s+, J4s+, T6s+, 96s+, 86s+, 76s, 65s, A2o+, K5o+, Q7o+, J7o+, T7o+, 98o }
You can see that Ace high here is a favourite on this flop vs a wide range which makes this an easy call. We don't have to bluff later streets and we can just check it down.