Not grumpy but to the point. I'd write something like this.
I'm on this site to look for a genuine lady aged between X & Y who is single and has no children. If your intentions are to ask me for money, pronounce to me your undying love for me in your first message or any other reason other than to seek a genuine loving relationship, please don't contact me as you'll be wasting your time.
If you're still reading and want to know more about me, Hi, my name is Adam, I'm 31, I'm caring, loving, blah blah blah.....
That first paragraph will make the scammers sit up and think "hey, this dude is clued up" so I doubt if they'll bother. The genuine ladies will see you as serious and will respect you. It does sound a bit grumpy so you have to make sure the rest of your profile makes you seem like a nice guy to balance it out. Add a few happy smileys if you're able to. If not a few lol's. Just make yourself out to be a happy positive type of person, and a bit of a romantic perhaps and let them contact you.
Might be a good idea to tell them your stance on religion too.![]()