Buprenorphine at temgesic dosages definitely gets you high with a low tolerance, since doses under 2-4mg sublingual (<1-2mg insufflated, <0.66-1.33mg IV) don't fill up ALL you opioid receptors with bupe, letting bupe's main metabolite, norbuprenorphine, a full MOR agonist pass through and activate the Mu Opioid receptors (MOR).
The higher your opioid tolerance gets while using full agonists, the more and more Mu opioid receptors are created, along with your endorphins (and possibly endocannabinoids) being downregulated. The more and more receptors you've created as a consequence of your opiate binge(s), the harder it is for your natural enkephalins, endorphins, and dynorphins to fill up enough opioid receptors to stabilize the person, failing to keeping them out of withdrawal, hence, physical dependence. So, for hardcore opioid users (IV heroin and other strong opioids for a long time), then yes, it makes sense to take more than 2-4mg sublingual bupe as a maintenance dosage, to fill up all those extra receptors you were making with each progressively higher and higher dose.
However, most opioid addicts do just fine taking 4-8mg SL 24 hours in, and then 2-4mg SL 48 hours in, then 2mg SL once a day for a couple weeks to a month, during which they slowly taper down to bupe dosage of only 0.5mg once a day or once every other day.
For example, BlueHues, youare getting more opioid activity (not saturation, but Mu activation) with your 2mg SL bupe dosage compared to taking 8-16mg and saturating your MOReceptors and DOReceptors with Bupe, which is a competitive partial agonist with a much higher affinity for the mu opioid receptors (MOR) than its full agonist metabolite, norbuprenorphine.