Well, there's Pokémon, which sold "quite a lot" and had lots of collecting / grinding.
See also Animal Crossing, which gives people plenty of collecting and display opportunities. There are fossils, furniture, fruit, paintings, songs, haircuts, fish, bugs, etc etc. AC appeals to casual gamers because you can do 10 minutes a day and get enjoyment from it. It also appeals to hardcore collectors because there's so much to collect, and some of it is "rare".
See also Animal Crossing, which gives people plenty of collecting and display opportunities. There are fossils, furniture, fruit, paintings, songs, haircuts, fish, bugs, etc etc. AC appeals to casual gamers because you can do 10 minutes a day and get enjoyment from it. It also appeals to hardcore collectors because there's so much to collect, and some of it is "rare".