I see it this way Teto:
if 75% is the cap, and you get 5% per DP AFTER the first one, then you would have to rack up 16 DPs to hit the max cap for the "stat reduction" due to your DP. Each one lasts 5 minutes so 75 minutes later at maximum, your stat reduction will disappear.
Also, the devs said this is on a scaled curve. If you look at what generates the most DPs in the game, it is only high level instant kill attacks by epic mobs or maniacal debuffs from Satyr Isle or EB inhabitants. This means most of the DP generation will be at the highest end of the curve. Most lower level players are cautious about too many DPs and will be at the other end of this "curve" which means the penalty won't be as bad for them.
Hopefully, by reducing the death points by eating foods is as effective as ambrosia and will reduce the stat reduction time the next uneventful DP comes along.
Best word of advice after this is all put in place... DON'T DIE!
If you do, DON'T KEEP DYING! If a Fafnir, Reklar, or Valkor fight is going really bad, it's time to regroup.
And for the Devs... get rid of the "Insta Kill" attacks these mobs have. It's rediculous for any creature to deal out 11K - 17K of damage in one shot without us having some sort of protection. (The one ShadowDragon uses is negated if you are wearing the Shimmering Scale, but if you are a bi-ped healer tagging along... kiss your rear goodbye... Justa has been hit by that from SD and I think 13K damage is a bit excessive.)