This is insane.
Costs atm to build 10 masternodes are about 1.4btc (1.16 for 1200 8bit and some for a vps). You will receive 5-10 8bit a day? (At this moment)
Calculate how soon you make profit.
Opening and hosting a masternode should not be easy - quick profit. It's more like a long term investment. That's why you should really believe in the project before investing in a masternode. Masternodes have been active for a short time but there are already 78 active masternodes on my list. So we've got a good community over here. I am sure the price will will rise as time passes on, if not, I'm still glad that I am supporting this project because with all the scammer devs around, this project's dev has shown a great potential. He has been active since day 1. And the other part is that I like 8bit concept, the wallet design and everything.
I have 2 masternode, but can I make off my wallet? and my pc can I off? or if I off all 2(pc and wallet) the node will continue staking?
No. Your wallet should be online all the time.
And as for profit wise I'd like to add that it takes 2000 days right now to get back the 1000 DASH invested in a DASH masternode.