grading/conservation of gold proof Britannia series

[breaktwister]

I am nearing completion of a full series of gold proof Britannia's from 1987, all 1/10 or 1/4 oz.  I am considering grading the series and perhaps seeking some conservation on a few of the 1/4oz pieces as I noticed some oxidation/small black smudges on a few, and a few that have a single pin-prick size red/black spot.  Is this the type of imperfection that can be removed by NGC conservation? 

Also, given that these are modern coins, is it worth grading the series if a lot of them will be PF69 or worse?  In my limited experience, a modern coin grading 69 has little to no uplift in value.

My goal is to maximise the value for a long-term hold, not a quick flip.

Just wondering what the forum members thought (Numi especially as I believe I seen one of his youtube vids and he was going for a full graded series).

[Pete]

I also have some beautiful gold proof Britannias including some rarer sets all in perfect FDC condition.
Where would you sell a great set to get a decent price ?
BullionbyPost and other dealers advertising proof coins & sets at up to 100% margins will only pay you bullion prices.
I haven't considered selling but my experience of lower value proof gold coins, boxed and certified, is that the selling prices are disappointing.
Spending more on grading to me would be pointless but that's my opinion, especially on the smaller fractionals.

[Roy]

Hold. Their time will come 

[Panda82]

I'm also starting with some 1/4 oz proofs, my goal is complete the series and get them graded, i think they look better that way , I will pay for my pleasure, personally 

[breaktwister]

I was thinking the same Pete regarding the 1/10oz, but if I'm grading the 1/4s I'll want them all slabbed!

I could slab the 1/10s myself using quickslab or PCCB holders.  

Still unsure so will hold off for now.