Personally, I don't like these split names... like holy**.it
If the break in the work is logical, it makes a lot more sense but the way you have them is an unnatural break. I stay away from those myself... but be my guest!
I think the key is... they are neat to look at and say.. wow, that's kind of cool. But beyond that, I don't see the value.
ma.. That's an interesting extension... means "but" in Italian what is it though? Malaysian or something? I think your best bet is on pu.ma though if you're lucky... look to sell that one first...
i agree with trig, if the break is natural in the phrase like love.me or my.name it's worht more, however, pu.ma is a very nice name and is short and easy to remember. mam.ma is also short and easy to remember. Due to that fact they can go for mid to high $xx just for shortness value.