As the saying goes, there are many possible reasons for an insider to sell a stock, but only one reason to buy -- they expect to make money. So let's look at two noteworthy recent insider buys.At Archrock, a filing with the SEC revealed that on Thursday, Jason C. Rebrook purchased 10,000 shares of AROC, at a cost of $24.17 each, for a total investment of$241,670. Rebrook was up about 2.5% on the buy at the high point of today's trading session, with AROC trading as high as $24.77 at last check today. Archr ...