Try not to feel normal ups and downs as kicks in the teeth, and try to move the opposite way of the crowd.
There was a shortage in the supply of cards.. (no new cards to be bought) for quite some time which drove up the price of cards and rentals. During this same time, many new users came to Splinterlands and wanted cards. No Supply, high demand.. Price goes up.
Now there has been a sudden influx of supply to the market.. New cards, new attention, new focus.. So, it makes sense that the old cards would see less demand right now...
Over time as a newly released cards sell out and the brand new attention fades, the old cards are now Rarer and gain demand again.
For those who have time to wait, it might be a great time to focus on buying the old cards while everyone else is looking at the new ones. (not financial advice, just thinking outloud)
The great unknown, how long will the new supply of cards last and how will they compete with the old cards. Anyone who knew the specific answer to that could get quite wealthy ..
:) Good luck in your choices.