If you want to try it, first, make sure you know how it works.
Second, make sure you know your margins. Remember, if you make a sale the PLS rate is NOT charged on the item price, it is charged on the total: item price, sales tax, and shipping cost (I'm guessing shipping isn't too high for most of your stuff, but it is still a consideration.)
Start by testing.
The minimum rate is 2%. Start with that. NEVER start with the suggested rate. Run some tests at various rates to see what works best for you.
Do NOT start by putting all your listings into the campaign. Be selective. Think about your goals. You sell in a niche, so you might do well to promote some of your most interesting items....people who collect old photos etc are likely to take a look at the rest of your store if they have clicked on one of your items, so the PL might not sell, but you might sell other items because they clicked into your other listings. Because of the way the ebay "Halo" fee works, you would probably be foolish to use PLS on all your listings at one time. (If you don't know what I mean when I say "halo" then you aren't ready to start using this because you don't yet know enough about it. Go back to Step One.
Test your way into the rates, and ALWAYS remember that the goal is to increase your sales velocity AND your overall profit. That means you NEED to know your numbers.
And most important: keep in mind that a crappy listing is a crappy listing, whether it is promoted or not. (This isn't a comment on your listings, I didn't review them). A high PLS rate can get you more impressions, but it can't get you views and it certainly can't get you sales. PLS gets you impressions, quality listings get you sales.
