I feel the same way about failing to pull the trigger on my DEC bulk buy a few weeks ago. I knew I should have done more to free up capital when DEC was sitting at .70c / 1K. I bought as much as I could afford to at the time with my excess hive-based tokens, without making any exchange/wallet DeFi swaps. Well, that decision backfired. DEC is now nearly 40% more expensive than it was 2 weeks ago and my other tokens haven't appreciated nearly as much over that same period. Like you, I should have seen the writing on the wall and done more to buy the DEC I needed when the price was the most depressed. Oh well :-/
I bought some DEC late. Enough to cover, but I could have done the same - bought far cheaper. I also feel that I should have bought more SPS at the recent ATL.
SPS will continue to drop lower over time through its scheduled printing (inflation) as I believe we will see people siphon their earned SPS into more DEC to buy Rebellion, whose cards will have a strong ROI in the rental market and as well as ranked/tournament play.