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Hi. I suppose the first question is whether they were similar sized items: I have seen this design in a range of sizes. That said, ebay sale prices can vary wildly, so it is hard to say whether you or the ebay seller got lucky (I suspect the latter)! Last year I sold several Perthshire PP1 paperweights on ebay, within a period of a few months, for prices that varied by a factor 8. In the last few weeks one Harland fish sold for a very high price (equivalent of US $700 I think), whereas a similar one did not sell even though it was on offer for less than a quarter of the price. There seems to be little logic to what some pieces sell for: there is probably a 'typical' price for an item, but some big variations about that.
Alan