Great question Rich.
2. eBay you can raise the price anytime you want, it's an open market. I've watched Dean raise his price on his 51 Mantle from 10k to 15k over the last 8 months in response to the market.
1. BST is a little different and I don't think there can be a hard and fast rule. If I pull up a dormant post from 9 months ago and say "I'll take it" I wouldn't expect the seller to honor that. I would send a pm and ask if the card is still available and enter into a negotiation based on current market value.
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