I am not going to speak for all guys...because that would be a huge generalization, but will speak for myself and what I assume is a large percent of guys...
Ok, got the disclaimer out of the way..
"I still think its more nutral, like guys just not being ready for a relationship and not wanting to give girls false hope, but still enjoying to spend some limited time with a woman."
While I think that you describe some guys... I think what you describe may be more idealistic, romantic, and even a bit naive, when it comes to P4P and guys.
When I was younger and single...I tried to go out with as many girls and even tried to date multiple girls at one time... quite frankly, I wasn't being considerate of the girls, and wasn't thinking about a relationship... I still engaged in P4P, because, I liked sex and it was fun.. Plus, young guys with money, tend to blow it away as well..
Now that I am older and married...I still have that physical desire that P4P fulfills, and no risk/stress that could come if I were to engage with a non P4P partner.
Then there is a group where P4P, and Sugar Dating evolves to be not 100% physical, but also filling an emotional desire. I see and understand that...but thats not me.. yet.
Hope I didn't ramble too much.