How much for a really small slice?
When the hardware store sells you a single screw for a dime, shouldn't they just give it to you? Especially if you're a good customer?
Shouldn't that singer (you bought all her albums) return the love? You're only asking for a few seconds, a hug, a handshake, an autograph...
It's easier than ever to break your offering into smaller bits, into pieces that are part of the whole but are tiny on their own.
Add up enough small slices and that's the whole cake. Asymmetry is the rule now, not the exception.
Small slices can't be free in the long run, not if that's the only kind of slice there is.
Either you need to figure out how to sell your small slices, or you need to invent some big slices that are obviously worth what you need to sell them for.