970TBONE - that is hilarious! I would have paid good money just to have seen that one. Sir would you like fries with that....er.... you smell like elk pee sir! I'll have to ask you to leave the premises sir!
I used scent killers, scents and elk urine routinely when I began elk hunting. I always thought it made a difference. I now use no scent control at all, no oils or masking scents and no urine. I simply use the wind to my advantage in EVERY situation. I can say I am able to routinely stalk up on elk to well under 100 yards without them ever knowing I'm there. If I hunted from a stand, perhaps I would notice a difference in results. But while still hunting, I would have to say there is little to no difference in ability to approach elk with the wind in my face.
If you have more confidence in your hunting tactics using scents and scent control spray, go for it. If you're not sure, save your money.
I'm like you and use the wind. I do try to mask my scent somewhat though. I don't get carried away, but I do put some effort into it. I'll tell you why.
I only hunt in the mountains. The wind is un predictable. I can't remember the times that I had it all perfect and was moving into an elk and the wind swirled and busted me. With no scent control at all the elk is gone. With some effort to cover my scent. The elk might hesitate long enough for me to get a shot off.
Try to put your tree stand in a tree with plenty of background cover, keep the prevailing winds for that time of the year to your face, and take care of those pesky squeaks and creaks your stand may have developed while sitting in the shed. A good treestand lube can be made by heating petroleum jelly until it reaches a liquid form. Some hunters have reported success by including a cover scent in this mixture before applying it to their stands.