Can I ask for wedding money instead of gifts?

Well, it's rude to ask for anything, and especially rude to ask for money. You certainly wouldn't include this anywhere on your invites, in with your invites, or anywhere near your invites. Avoid registering anywhere.

Most people get the hint then that you don't want material things but even then if someone decides to give you something other than cash, you accept graciously, thank them, then decide what you are doing with it after they are gone.

You're missing the point. You don't include this information anywhere at all. You don't write your guests (in the invitation or any other format) requesting gifts, specific or otherwise.

It's just plain rude. Your guests will get you a gift of their choosing if they decide to get you a gift at all. Gifts are not required, and requesting a specific gift makes your guests (emphasis on the word guest, making you the host) feel like they're obligated to give you something.

If you want to send a hint that monetary gifts are preferred, don't register for tangible gifts. Let that information get out by word of mouth. Most people will take that to mean that you have everything you need and cash is preferred.

You will very likely still get tangible gifts and, you know what? That's fine. Be gracious, write them a thank you note, and move on.

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