If the real meaning of what you've actually mentioned is taken, then you will exactly break even OR have a loss of $2000. Let me explain :-
Your title "Spend 5000$ for receive 5000$". What is the point to spend an amount & get back exactly the same amount back ?
Your description "I can spend 5000$ on ads, I am ready to get back 3000$ (or more) : Why spend an amount and get back less and lose money ?
I know that you mean to make a profit of $3000 or more by investing $5000. However, the MORAL OF MY STORY here is that words in writing must be made very thoughtfully otherwise it could mean something totally different, like in this case of your's. DOES IT MATTER ??? Oh yes it matters. The entire result of an ad campaign sometimes depends on CONTENT and that ad content may just be a line or two, but how those lines are written to mean what MATTERS A LOT. So, if you are positive minded, you would take my observation as a learning. I love learning and will continue to, because it helps me grow.