Everyone knows BlackBerry (BB -2.79%) is in dire need of a sugar daddy. However, the investing community remains sharply divided about just how much the struggling Canadian smartphone maker is actually worth.

Analyst estimates vary to a nearly comical degree, ranging from $5 on the low end, to as high as $20. And, while the company's true worth its obviously up for debate, most agree the company still has several truly valuable assets under its umbrella, one of which is its BBM messaging franchise. Many believe the BBM could, and should, be spun out as an independent company, as the mobile messaging space, in general, is still ripe for consolidation. But, as is the case with BlackBerry as a whole, just how much a BBM spin-off would fetch BlackBerry shareholders is anyone's guess. 

One bold analyst recently made waves, claiming BBM is worth at least $5 a share, or roughly half of BlackBerry's current share price. In this video, tech and telecom analyst Andrew Tonner puts this valuation for BBM under the microscope for review.