Depends on the coin. Some things tick boxes but are generally uninspiring, both in condition and interest, such as the numerous varieties of long cross pennies, some of which are only available in VF or worse. Others in that category are really nice coins in themselves, mint state but boring - such as 20th century bronze or most other modern milled for example. Others are difficult to find, so buying them becomes a priority such as some patterns where there are no more than one or two known there is a thrill in establishing the best example acceptable and then finding it. General appreciation is enhanced when you can add a bit of historical info such as provenance, or where you have waited for years to find a specific coin.
It also has to be said that some things just appear, so the enjoyment is solely having been in the right place at the right time.
Just as with the question, 'What is your favoiurite coin?', this shifts from day to day, week to week.
It might surprise you, but the attached gives me satisfaction. As a coin it's a real dog, but given the only other known example (VF) had sold 3 or 4 years before for £2K plus juice, the appearance of this in 2003 and the recognition that it was an opportunity not to be missed, made a sensible bid the only real option. Sod placing a low bid on ebay in the hope that the vendor will offer it cheaper in the future. You may not, indeed are unlikely to get the opportunity to revisit the coin on a relisting, so putting in a proper bid at market value made complete sense. The underbidder was nearly £400 below me and obviously hoping for a bargain at a basement price. 13 years on, I still like it for what it is. I like it for the minutiae you can extract, such as the person who set the dies in the press obviously aligned them by putting the French arms against the top of the obverse - clearly the case as it is the only set of arms in the correct location with the die axis as seen.
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