When considering purchase of a boat made by the Commercial and Government Products division of Boston Whaler, get the hull identification number (HIN). The HIN will have a distinctive manufacturer identification code (MIC) prefix (WCG) if the boat was made after c.2001. If the HIN has the MIC of BWC, it was likely made before c.2001.
Once you have the HIN, you can contact Boston Whaler to obtain more information about the particular boat. The boats made by Boston Whaler Commercial and Government Products division tend to be custom and made-to-order. If Boston Whaler can give you information specific to the particular boat you are considering buying, it could be useful.
As in any purchase, price plays an important role. Often the disposal of older boats used by government agencies can be a source of bargains, as long as the particular hull being purchased is in excellent condition. I would not bid on or tender a purchase offer without seeing the boat in person and being able to make a close inspection of it.
As for there being some sort of universal and relentless attraction to commercial boats being offered for sale, I can't say I share that notion. A lot of them are beat up and need substantial and expensive repair. A good example can be seen in an article about a restored Boston Whaler 22 RAIDER that was extensively refurbished by the Lakeside, Ohio, fire department; see CETACEA PAGE 35 at
http://continuouswave.com/whaler/cetace ... age35.htmlA lot of volunteer labor and effort went into the restoration, far more than I could ever imagine investing myself.