I agree sel_69l I have coins I keep in slabs, even ones I sent in to be slabbed, but none of them are coins I truly enjoy, like my oldest raw colonial and EAC coins, and Two Cent Pieces
. I want, and need to be able to see them in hand to identify them without plastic in the way, to measure them, weigh them, etc. Ultimately to store them in a way that make sense to me as well, slabs just don't fit in that equation any more. Not to say the slabs don't have purpose and some, I might even keep in the slabs for protection or financial reasons. I'm sure if I had millions of dollars in high value coins they would be mostly slabbed, but what I do have it just doesn't make sense for me to slab them, I already know what they are, I don't need confirmation of grade or in many cases the variety (which most TPGs wouldn't even accept or use), and I certainly am not willing to spend my hard earned and seemingly ever decreasing dollars to pay for that privilege.
There are definitely good reasons to have coins slabbed, in in terms guarantees (financially), and for protection they do offer that. Liquidity, sight unseen sales, or even seen in photographs only sales. But over the years I've learned to grade from some of the best graders around in the business, I trust my eyes, and I know where to turn for opinions, if I'm ever questioning myself. Heck I was even offered work at a major grading firm in the late 80's and again by a different firm in the 90's both of which I turned down. I saw too many graders get burned out from grading coins day in and day out. Sometimes you want to enjoy your hobby and your business, not work it like a slave owner.
I don't however think I know everything, and I'll often go to others for opinions on varieties and die states, as well as values. I like the Richard Picker way of market pricing and grading all in one.
"You like that coin? How much do I want for it? I'd say it grades right around $150.00"
Richard priced his coins, he didn't put a numerical grade on them, that way there wasn't any ambiguity. You either liked the coin of not, at his price. Richard was also a consummate professional numismatist and always willing to help answer a question or help figure out a die variety. He is one of the great old school coin dealers and sorely missed today, like Art Kagin, and Elliot Goldman to name a few of the top of my head.
They were some of my mentors and they came up through the coin dealer ranks pre-slabs.