Satisfying sex and satisfying fetishes don't have to be mutually exclusive. Each to his or her own. The wonderful thing about having these human, very physical forms with a multitude of sensors - skin, nerves, smell, sight, sound, taste, touch, etc - and central computers we call brains that can enhance, deaden, simulate, and otherwise prompt reactions to various stimuli and situations, is the almost infinite responses each of us can have. This applies to every kind of physical, emotional, and mental situation imaginable.
It doesn't have to be related to tickling. It seems to me that those of us who are into tickling often fall into thinking our thoughts, feelings, and actions are somehow unique. They are unique in that the central thesis involves some aspect of tickling, but otherwise, we share much in common with the rest of humanity.
The wonderful thing about tickling (or any other fetish, preference, desire, obsession, etc, etc) is that it covers a broad spectrum from silly, innocent fun to deeply erotic intimacy. Our community is hopefully broad enough to encompass every variation within the tickle spectrum.
Suppose you enjoy tickling to any aspect of sex, great. There is room for you. If tickling is an integral part of sex for you, there is a seat for you in tickleland.
There is no right or wrong way to express an interest in tickling. The bottom line is, are you happy where you are? Yes, carry on. No, dig deeper to find out why and figure out what to do about it.
I can't imagine sex without tickling. But that is just me. What works for me may not work for you. If you can't imagine sex, period, but tickling is the cat's meow, enjoy. Or maybe you compartmentalize the two - sex but no tickling and tickling but no sex.
An infinite number of ways to go. None better or worse than any other.