Expression: 'the point to' (What is the point to do that?)

[Navi]

Can one say:
1-The point to do that is to help others.
instead of:
1a-The point in doing that is to help others.

Can one say:
2-What is the point to do that?
instead of:
2a-What is the point in doing that?

[Mister Micawber]

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Both sound strange to me, navi.

PS: Welcome to English-test.Net. I didn't know you were here.
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Native English teacher at Mister Micawber's

[Navi]

Thanks Mr. Micawber,
How could I not join when I knew that YOU were here?!
Apparently, I joined in April 2006 and this is my tenth post. So logically, we must have met here at least once or twice. In any case, you do have a point. For someone like me, 'ten' isn't really a lot. I'll have to come here more often.

[Mister Micawber]

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Maybe we did meet before here, navi-- I forget who I know from which site!
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_________________
Native English teacher at Mister Micawber's