Adjust lastTimeIn to only account transactions >1BTC. Some of the richer address have "donations"/advertisements that random people send to them to post a message in hopes others checking out the richer address will see. For example

• 1933phfhK3ZgFQNLGSDXvqCn32k2buXY8a - 2012-11-15 (lastIn >=1BTC)
• 1FeexV6bAHb8ybZjqQMjJrcCrHGW9sb6uF - 2011-03-01
• 1HQ3Go3ggs8pFnXuHVHRytPCq5fGG8Hbhx - 2013-04-09