probably because in the process of taking away the incentives you also take away the ability of reciprocationOk, the question is simply this...
"Taking away all the incentives, both positive and negative, would you still choose to worship your god?"
The honest answer would obviously be...
"No!"
even stranger would be the notion of participating in a loving exchange with an entity powerless to reciprocateBut in honestly answering such a question a Christian would be admitting to the fact that their love for their god is conditional.