Similar story. I did not sell the cards right after I opened the pack the last time. The market value dropped after, and the existing car value is way below my initial investment.
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I will keep them and probably lease them to my alt account, to see if I can score some cards there. Won't sell any of the cards until I did level them up to the max my summoners can cope with.
!LUV
It's better to keep them if one plans to use it in the game. For random investors, things could be different.