I think their only reason to look for us would be knowledge: studying a civilization at its early stages. But it could be that by the time they receive our message and send a "scientific mission" to look for us (potentially many thousands of years, who knows) our technology would be more powerful than theirs, or maybe they could find nothing left alive on earth. So I guess they would be approaching very carefully anyway (probably hiding themselves), also to prevent a potential impact on our culture before they have some knowledge about it.
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I think their only reason to look for us would be knowledge: studying a civilization at its early stages.
But it could be that by the time they receive our message and send a "scientific mission" to look for us (potentially many thousands of years, who knows) our technology would be more powerful than theirs, or maybe they could find nothing left alive on earth.
So I guess they would be approaching very carefully anyway (probably hiding themselves), also to prevent a potential impact on our culture before they have some knowledge about it.