Yes keep the bullion separate. I have some sovs that my beloved keeps 200 miles away from me purely as bullion. If they were in my collection I would despair at the condition. My lesson here is always collect bullion coins in person. I learned this because when I collected in person I was sold a nice 1968 and 1974 one. Having the coins sent they were a grotty 1913 and 1930 that were scratched to blazes and had probably come out of rings. Absolutely not collectable but still perfectly acceptable as bullion, and I would be very disappointed to lose money on them. I have some silver proofs in the collection where I paid a lot more than the bullion price. However the coins really are beautiful to look at Fairly Decent Coins ;-) which will give me a lot of pleasure over the years. If I was to sell these I doubt I would make money on them, and almost certain I would lose. Keep the bullion and the collection separate.