While you have been on eBay for some time you appear to be a fairly new seller. It is not unusual for items to go a long time with no views it just depends on what people are looking for at the time. There is no way to prove promoted listings improves sales. It is a race to the bottom as you have to either incorporate the PL costs into your pricing or take it out of your profits. The only real winner is eBay as it increases their revenues.
I have never used, and never will use PL.
As for it being "out there" you currently only have 7 items listed and have sold 9 items in the last 90 days which is probably not too bad. I did a search for a couple of your items, shown below, and your items are "out there" and in most cases you are the lowest priced. One thing to consider is you offer free shipping which has a couple of potential disadvantages to both the buyer and seller. While eBay is always going to charge you FVF's on the shipping whether it is baked into the price and using free shipping or whether it is separate from the price, aka calculated shipping. Some buyers find free shipping to be attractive I avoid it.
First about 1/2 of the states do not charge sales tax on shipping if it can be identified separately as with calculated or flat rate shipping. Since the buyer is avoiding having to pay sales tax the seller is avoiding having to pay FVF's on the sales tax. Small amounts as far as $'s but it's a savings.
Unfortunately the items you sell are not eligible for the eBay International Shipping program since you cannot send perfume by air. As for the profit you are the only one who knows your investment return and whether "it is worth it". Crunch some numbers, suggest building a cost model, where you can input ALL your costs/expenses, what you list the item for and determine if you are satisfied with your return.
