Most Helpful Girl
Do nice guys really finish last?
I find most guys who describe themselves as nice guys or who others can't find anything to describe them but nice are often quite lacking in personality, character, and desirable traits*. There's nothing to little appealing to them but being nice and that's often a default expectation of a partner.
*In my opinion the only desirable way to call yourself a nice guy is when you're like Gandhi.
Most Helpful Guy
The ones who act weak to the point of treating the girl like she's jesus, yes.
It's a bit messed up in some circumstances, but imagine someone horrible who can't get any dates. May be looks may be personality or whatever. They're more likely to be desperate and all over the girl.
So when a guy does the same things regardless of decent personality/looks, it portrays she can do better. A strong reaction right away in trades always makes the other person they should have offered less or asked for more.