Around a year ago the Grin Community Council bought up a sizable amount of Grin since we want to have enough Grin to pay our groundskeepers and developers partially and in some cases fully in Grin.
On the long term we prefer to have a passive Grin income via the large number of miners we bought that were not operational at that time yet:
This is even better than buying Grin since we are dollar cost averaging, providing security without dumping mined Grin on the market. Instead we use the mined Grin in day to day payments which is what Grin was build for 
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Therefore I do not see the need to buy Grin again using the community fund, although I have to admit I was also tempted by the though since it is likely a good time to buy Grin. However, we try to avoid buying for ‘speculative’ reasons as we stated in the spending guidelines for the Grin Community Council. Since we have passive income in Grin now, we do not have much reason to exchange BTC for Grin.