But fold equity works in two ways, i.e. Yeah as others have said.. this isnt really fold eqity but still ...
(1) You raise for an amount that would make it wrong for your opponent to call. Yes .. against a single fish makes a mistake here because he takes incorrect odds, but a table of fish will call meaning that although the current pot odds are incorrect to call, the implied odds are sufficient to call thus the single fish isnt making a mistake by calling.
(2) You only call bets if the pot odds exceed your drawing hand odds.
When fish-handling, do you you neglect both (1) and (2)? I would say you put far less emphasis on 1. You still play correctly yourself, although you can also call with infufficient pot odds in early position, if you feel that there will be enough callers to give you correct implied odds.
As raising dosnt cause the fish to make such a mistake (as explained above) its better to play more passively without the nuts. i.e. play your big drawing hands as cheaply as possible unless you hit (no fold equity to exploit) Do not overvalue top pair... you are less likely to get drawing hands to fold to a raise, so let it play out natural.
By fancy play, do you mean things like check-raising, and so on? Yes, it happens all too often that you check raise, with the intention of thinning the field a bit, but because they have put money in that round they feel obliged to call.. great if you have the absolute nuts.. but if you have a handthat can be outdrawn it would be nice to get rid of a few of them.