crok:-

to the CCF
!The sort of collecting that you are indicating is small bullion gold.
Currently the buy / sell spread for gold is around 8%.
A bullion dealer couldn't care less if the bullion gold you may be selling back is Proof-70 or not.
Or, to put it another way, a bullion dealer will not buy back with the high premium for small gold that you may have paid for in the first place.
A
coin dealer when buying back, may well have the same sort of buy back policy. No reason why coin collectors on
ebay should be any different, either.
You must do your research on market conditions first, before committing to any decision to buy.
At least, if you buy from a bullion dealer and keep all receipts, you are guaranteed to buy only genuine coins, irrespective of if they are slabbed or not, and are in the best position to give that guarantee of authenticity to a prospective buyer in the future.
There is nothing wrong with buying small bullion gold in MS-68 direct from a bullion dealer, for a standard bullion price, then encapsulating them yourself, and thus avoid slabbing fees and shipping costs.
Remember: "
All that glitters is not gold" - Shakespeare: Merchant of Venice