Actually, the $40-$50 a day is below minimum wage here where I live. If you got $50 a day that's $6.25 and hour. Minimum wage here is $6.55 and going up to $7.25 the end of the month. I know there are many businesses in my area that have full time data entry people and I image they are making at least minimum wage. So, yes, it is very possible to make that kind of money.
Now, work at home? I don't know. Have you looked at
www.mturk.com?