Are (suited) connectors always an implied odds hand?

[TanukiTen]

The way i understood it so far, AK or AJ for example is a negative implied odds hand, because if the flop hits me, i won't have many callers(if they fold correctly with draws or weaker hands).

And (suited) Connectors are implied odds hands, because i get more money in the pot, when i make my draw.

To my question:
Now, if i have 7 [img]/images/graemlins/heart.gif[/img] 8 [img]/images/graemlins/spade.gif[/img] for example and the flop comes 4 5 6 rainbow, a lot of people will smell a draw and fold and my implied odds go down the drain. similar if i flop a flush or flushdraw.

So does that mean, that implied odds hands can also turn out to be reverse implied odd hands?
Or is it just that in generall i will get my implied odds and just in very obvious situations not.

Or did I get the principle wrong anyway?

And where is the line or grey area between implied odd hands and reverse IO Hands?

Thx for any help