In a perfect world, we'd all have the time and resources to evaluate every potential solution. But more often than not, we're asked to make critical decisions with very little time to do proper research and weigh the alternatives.
One result is that you find yourself in the unfortunate position of having to rely solely on the input of salespeople when making important decisions. Don't get me wrong -- some of my best friends are salespeople. A good salesperson (and there are many) will consider your business goals and recommend a product that works well for you at the best price point, just like a trusted advisor would. Sure, they get a commission, but they provide a service in exchange. If time proves the recommendation wise, they know you'll come back again.
Of course, it's no secret that many salespeople are more interested in making a down payment on a boat than in getting you a good deal. This seems especially true in the storage market. With a big-ticket sale, the motivation to cultivate a long-term relationship built on trust may be trumped by a yearning to get in, grab your cash, and head for the hills.