I fear this is going a little off topic, but it depends on what you want from a drug experience as to whether you'll find salvia positive for you or not.
CreativeRandom, from your posts it seems you prefer drugs that give you euphoria, relax you or give you energy. None of which are essential characteristics of a psychedelic drug, and I would go so far as to say that most people arnt primarily looking for those kind of effects when they take psychdelics. If you want euphoria or energy, that lasts for a long time, pick up the stimulants...
Entity contact? Not that much to get worked up about? Er, really? Id place salvia in a very limited class of drugs (along with DMT, 5-meo-DMT and possibly ketamine) in producing a very powerful, full blown psychdelic and often fully dissociative experience.
Sure, if you want a seriously euphoric or long lasting experience, maybe don't pick salvia. That doesnt make it any less worthwhile a psychedelic.
I think you'll find the reason its not more popular is that it doesnt have those kind "recreational" characteristics that MDMA, mushrooms or LSD have - its not a drug for kids to get high and have fun on, its a seriously mindwarping experience.
I too have had a load of 10x extract sat in my room for many months. I've used it a few times, and the reason i dont go back to it more often is because it is so powerful. My last experience was somewhat scary, and I'm waiting until I feel ready to try it again.
For the original poster, if you're still having problems getting any effects, I can suggest you use a jet flame lighter - salvinorin has a pretty high boiling point, so you need to get it really quite hot. And if you have to take multiple hits, do them in as quick succession as possible - you need to get the peak levels of the drug pretty high in you body for it to work.
PS what is "duster"? Are you talking about PCP?