I, too, once bought coins from Littleton's "Coins On Approval" system - until the packages became very expensive. I contacted Littleton, and requested they remove me from their "On Approval" program. No problem - except the coins kept on coming in the mail, and, being coins, I just HAD to look at them. That became an expensive "look" because I had to pay return postage.
My mailman advised me that, if I didn't want a specific letter or package, to write refused on the front of it, and send it back - unopened of course. Took a couple of returned envelopes, but they DID quit sending me coins on approval.
My opinion: Littleton does have nice coins, and their staff is pretty much "on the money" when it comes to grading. My only complaint would be in the pricing department. I believe, if they reduced their prices, they'd sell more, but, then, they've been in business for alot of years, so.....
Ralph