What percentage of SMR would you pay for BVG or GAI graded cards?

Just got back from a nice day of skiing and noticed that a card I had on my Ebay watchlist had ended before I got home.
It was a 1963 GAI 9 Willie Mays #300, which SMR has at $2400. Final price was $781, which is about 33% of SMR.
My question to everyone on the board is what percentage of SMR (or VCP for those who subscribe) would you generally be willing to pay for a GAI or BVG graded card in a similar grade?
Would this depend on whether you were buying the card as an investment or for your personal collection?
It was a 1963 GAI 9 Willie Mays #300, which SMR has at $2400. Final price was $781, which is about 33% of SMR.
My question to everyone on the board is what percentage of SMR (or VCP for those who subscribe) would you generally be willing to pay for a GAI or BVG graded card in a similar grade?
Would this depend on whether you were buying the card as an investment or for your personal collection?
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Comments
Later vintage (50's-60's) if it is mid-grade it really dosen't make a difference to me (buy the card not the holder), if it is high grade (8's) - I try to avoid altogether (at least my bids never come through).