Oh, I never sell anything in the game. It's too uncertain if/when items will be removed from the market or brought back again for purchase so I hoard everything like it's my job. Since our game info is stored on the s8 servers, it's not like I have to worry about taking up extra space on my phone so I figure there's no real reason for me not to keep every item. Plus, I'm a collector whose ultimate goal is to own at least one of every item ever on offer in the game, lol.
As for the goal itself, I finished and collected my Cupid Fountain which was a lovely addition to my collection. Still feeling a little let down over the recipe/appliance pairing but I'm trying to move on and start building my hopes up for the next goal