Greentown Service Group has given long term holders a very different ride depending on when they bought in, with the stock up about 58.5% over the past three years but still down over five years. With that mixed track record, the key issue now is whether the current share price lines up with the cash flows the business is expected to generate. A roughly 58.5% gain over three years puts real money on the line for anyone asking if Greentown Service Group’s recent share performance is supported…