Perhaps it is a waste of effort. However, if they go after black voters by pandering to their sense of racial grievance, the GOP will lose its soul.
That, and they will also make a mockery of themselves. About a year ago a new guy was made head of a local GOP office near where I live. He immediately pledged to do black outreach - a commendable effort in itself - but it all went downhill from there. To start his effort he hired on an incompetant affirmative action case as one of the party's office directors and began parading the poor fellow around as his token black officer. They initiated the "outreach effort" a few weeks later, which ammounted to a small group of white guys in suits plus the token black guy driving into the ghetto to a local soul food restaraunt once a week where they gave speeches praising themselves. They stuck out like a sore thumb and made a complete mockery of themselves (inadvertantly of course - but nevertheless a complete mockery). The newspapers made fun of them and they gained probably all of two voters before the program was scrapped then reinitiated under legitimate black GOP activists who knew what they were doing.